BENCHMARKS FOR MILK PRODUCTION SYSTEMS IN THE PERNAMBUCO AGRESTE REGION, NORTHEASTERN BRAZIL¹

INDICADORES REFERÊNCIA ( BENCHMARKS ) DE SISTEMAS DE PRODUÇÃO DE LEITE DE VACAS NO AGRESTE PERNAMBUCANO

ABSTRACT

The objective of this work was to identify and assess the technological, zootechnical and socioeconomic profiles and identify and quantify benchmarks for dairy cattle production systems, in a non - experimental approach, aiming to contribute to the sustainability and competitiveness of dairy farming in the Pernambuco Agreste region, northeastern Brazil. Thirty-six milk production systems of family and corporate farming were evaluated during twelve months, in order to identify and quantify the benchmarks. The systems were characterized regarding their size and technological, zootechnical and economic profiles. The correlation coefficients of the return rate on invested capital were assessed and regression equations were developed for each indicator, according to four scenarios of annual return rates (4, 6, 8 and 10%). The indicators evaluated were milk production per dairy cows, milk production per area, average price of milk, effective operational cost, total operating cost, total cost per price of milk and profitability. The dairy farming in the Pernambuco Agreste region pays the production costs, but tends to a not adequate remuneration of family labor and a need of external capital input for replacement of the assets. The productivity of production factors area and animals showed higher correlation with cost-effectiveness, denoting the need for increase the production through increases in land area and milk productivity per dairy cow. The identification and quantification of benchmarks may help to identify the weak points of dairy farming in the Agreste region, making it sustainable and competitive.

Keywords: Milk production costs; Milk production Economy; Economic indicators; Size indicators; Zootechnical indicators

RESUMO

Objetivou-se levantar e avaliar os perfis tecnológicos, zootécnicos e socioeconômicos, identificar e quantificar indicadores referência, para sistemas de produção de bovinos de leite, de caráter não experimental, de forma a contribuir para a sustentabilidade e competitividade da pecuária de leite na mesorregião do Agreste pernambucano. Para identificar e quantificar os indicadores referência foram avaliados durante doze meses, trinta e seis sistemas de produção de leite da agricultura familiar e empresarial. Os sistemas foram caracterizados em relação ao perfil tecnológico e aos indicadores de tamanho, zootécnicos e econômicos. Foram determinados os coeficientes de correlação com a taxa de remuneração do capital investido e geradas equações de regressão, para cada indicador, em função de quatro cenários da taxa de remuneração do capital (4, 6, 8 e 10% ao ano). Os indicadores correlacionados foram: produção de leite/vacas em lactação; produção de leite/área; preço médio do leite; custo operacional efetivo, custo operacional total e custo total / preço do leite e lucratividade. A pecuária leiteira no Agreste pernambucano, paga os custos mensais, mas a tendência é a não remuneração adequada da mão-de-obra familiar e a injeção de capital externo para a reposição dos bens. A produtividade dos fatores de produção terra e animal apresentaram maior correlação com rentabilidade, indicando a necessidade do aumento da produção, por meio do aumento da produtividade da terra e da produção de leite/vacas em lactação. A identificação e quantificação de indicadores referência podem contribuir para a identificação dos pontos frágeis da pecuária leiteira no Agreste tornando-a sustentável e competitiva.

Palavras-chave:  Custo de produção do leite; Economia da produção leiteira; Indicadores econômicos; Indicadores de tamanho; Indicadores zootécnicos

INTRODUTION

Dairy cattle in Brazil undergone changes from 1991, with a high increase in production and reduction in prices, leading to a need for improvement of the efficiency of milk production systems, from the technical and economic point of view (FERREIRA JUNIOR; TEIXEIRA, 2005).

Another change was the expansion of dairy farming to non-traditional regions, such as the Northeast. Pernambuco is the second largest producer state in the region, which had an increase in its milk production of 165%, which was higher than the Northeast (81%) from 2001 to 2011. This increase was supported by the Agreste region, which is the main dairy region of the State (IBGE, 2013).

However, the continued growth of dairy farming in emerging regions such as the Northeast is uncertain, mainly due to socioeconomic and technological factors, milk quality, environmental restrictions and management practices, which are important limitations to its sustainability and expansion (MARTINS et al., 2009).

A production system need to be evaluated and compared with another system or preferably with other systems, searching better results, to improve their efficiency. Benchmarks are important tools, since the figures for comparison are obtained directly from production units present in the same economic environment (GOMES, 2005; MAGALHÃES; CAMPOS, 2006).

Studies have been conducted to identify the main zootechnical and economic indicators which influence the cost-effectiveness of milk production systems worldwide. Gomes (2000) conducted one of the first studies, which was a reference for comparison the efficiency of milk production systems for many years in Brazil. Afterwards, Oliveira et al. (2007) and Camilo Neto et al. (2012) indicated the need for regionalized studies due to the different environments in which these systems are implemented. It is assumed that the technical and economic benchmarks are different between the production system groups adopted and influence economic outcomes differently, depending on the production system, market and management capacity.

Studies conducted in the Northeast region, searching to establish technical and economic benchmarks, used evaluations of single locations and technical and economic information of the last 12 months, questionnaires, simulations and panel techniques, aiming to identify and characterize reference systems or modes of milk production, which do not always represent the dynamic conditions of milk production systems throughout the year (MAGALHÃES; CAMPOS, 2006; YAMAGUCHI, et al., 2009; MOURA, et al., 2013). Therefore, the development of advanced and systematic studies in dairy farming in the region is necessary, in order to identify the main constraints and factors that determine a sustainable exploitation.

The objective of this work was to identify and assess the technological, zootechnical and socioeconomic profiles and identify and quantify benchmarks for dairy cattle production systems, in a non-experimental approach, aiming to contribute to the sustainability and competitiveness of dairy Farming in the Pernambuco Agreste region, northeastern Brazil.

MATERIAL AND METHODS

Thirty-six milk production systems of family and corporate farming were evaluated in farms of the Pernambuco Agreste region, which are located in São Bento do Una (41.67%), members of the São Bento do Una Milk Producers Association (PROLEITE); in the Central Agreste, members of the Cooperative of Ipanema Valley Family Farmers (COOPANEMA); in the county of Águas Belas (47.22%); and in the county of Garanhuns (11.11%) in Southern Agreste.

The producers were registered and production systems characterized regarding the socioeconomic and technological aspects: type of milking, feeding system, palm planting, fertilization for fodder production, artificial insemination, milk cooling system, male and female raising and breeding, management practices and main genetic group.

Evaluations were conducted to assess the available resources in the farms regarding the land area, animals, land structures and machinery, and quantify the physical resources and capital invested in the farm activity, disregarding the devaluations. Income and expenses were monthly and individually followed, using the nominal values of the period. Cost calculations and size, technical and economic indicators of milk production systems were evaluated according to Oliveira et al. (2007).

The economic indicators considered were the Effective Operating Cost (EOC), which is the total direct expenses throughout the year for milk production, including hired labor, general supplies, taxes, machinery maintenance and land structures; Total Operating Cost (TOC), which is the EOC plus the family labor costs and devaluations of the assets used in the farm activity throughout the year; and Total Cost (TC), which is the TOC plus the return rate on the average invested capital in animals, land structures, machinery, not annual forages and land area. The return rate on invested capital was calculated considering an interest rate of 6% per year.

The return rate indicators considered were the Gross Margin (GM), which is the gross income minus the EOC; Net Margin (NM), which is the GM minus the TOC; Capital Return Rate (% per year), which is the NM divided by the average capital invested in animals, land structures, machinery, non- annual forages and land area; Capital Return Rate, including land area (CRR), which was used as the main indicator of economic sustainability; Profit, which is the gross income (GI) minus the total costs; Profitability, which is the net income multiplied by 100 and divided by the GI; and Cost-Effectiveness, which is the net income multiplied by 100 and divided by the invested capital.

Correlation coefficients were determined between the size, technical and economic indicators and the CRR, in order to identify indicators that affect economic performance, using the Pearson's correlation procedure according to Oliveira et al. (2007).

Regression equations were developed for each indicator that showed a significant correlation (p<0.10) as a function of the CRR, to quantify benchmarks (Oliveira et al., 2007). In the regression equations, the main components were selected as independent variables and the CRR as a dependent variable. The values of each indicator were estimated, considering four real rate scenarios of annual return rate on invested capital (4, 6, 8 and 10%). All statistical procedures were performed using the SAS-9.2 (Statistical Analysis System), and a critical level of probability of 0.10 for type I error.

RESULTS AND DISCUSSION

The production systems were characterized mostly as family agriculture (83.33%), since according to Zoccal, Gomes and Leite (2016) family farming consist of family labor, cultural traditions and production and family farming systems are those in which the producer is owner and also work in the farm. The systems evaluated had family labor in the farm activity, main family income from the farm activities and the owner living in the farm or focused in its daily management. The other systems were considered as commercial agriculture, since their owners had higher incomes from other activities than milk production, and the labor used in the system were exclusively hired, except the managers.

Diversification of farm activity is common in family farming, however, the farms sampled had few producers developing other activities with higher incomes than milk (Table 1).

The practice of milking twice a day were performed in all systems and most were performed in the presence of the caw's calf. This practices may be cultural or possibly due to the low adoption of mechanical milking.

The herds consisted of crossbred animals, with predominance of Dutch and Gir breeds, with genetic composition between 1/4 to 7/8 Dutch x Zebu (DZ), and predominance of the 3/4 DZ.

All production systems used fodder supplementation during the dry period, mostly corn silage and to a lesser degree sorghum. Corn crops in region have high risk, and losses may occur throughout its cycle, thus, palm (Opuntia and Nopalea) crops was used in almost all systems, since it is greatly adapted to the soil and climate conditions of the region. Palm can be used as forage source when associated with a fiber source (WANDERLEY et al., 2012; RAMOS et al., 2013) or as concentrated energy source (ARAUJO et al., 2004; VERONALDO, et al, 2007) when its nutritional deficiencies are corrected (FERREIRA et al., 2009).

Most of the production systems used planted pastures or native vegetation as fodder in the rainy season. Cattle manure was used in all production systems as organic fertilization for the pastures, and few systems used chemical fertilization. The forage's contribution to the animal production was low due to its low availability and the lack of access to technological information.

Concentrate feed was supplied throughout the year, which contributed to raising the production cost, decreasing the competitiveness of the milk produced.

Despite the low adoption of mechanical milking, most production systems had expansion tanks for cooling the milk, however, this percentage was low, since the current legislation requires that 100% of the marketed milk be cooled.

Almost all farmers raised male and female cattle, and most of them reared females for future replacement, however, half of the systems were rearing male, which is considered a high percentage.

Few farmers used artificial insemination, denoting a room for genetic improvement of the livestock. Oliveira et al. (2001) reported that the genetic improvement through artificial insemination contributed to raising the herd productivity rates and consequently the economic indicators.

The adoption of management practices such as controlling the milk production, animal reproduction and finances was low. The adequate control of all resources allows the producer to make quick and objective decisions, which are critical to the success of the activity. In other dairy regions that are competitive the percentage of farmers that control these resources reaches 100% (OLIVEIRA et al., 2007; CAMILO NETO et al., 2012).

The average daily milk production of the sampled farms ranged from 50 to 200 liters per day. According to Zoccal et al. (2011), farms with this range are responsible for the largest amount of milk produced in Brazil, corresponding to 39.10% of the national production (Table 2).

The average daily milk production and the average size of the area for this activity, especially concerning the minimum values, indicate the fragility of the production systems evaluated, presenting inconsistent or variable production capacity. This situation is aggravated by the lack of technology, technical assistance and credit, and the semi-arid environmental conditions, indicating a need to increase the scale of production, in order to optimize the land area factor. Oliveira et al. (2001), Lopes et al. (2006) and Lopes et al. (2008), showed that production and area indices are related to the cost-effectiveness of the activity and the scale of production are key to reach attractive economic indices in milk cattle.

The size indicators average amount of lactating dairy cows, total amount of cows and cattle showed that the herd structure in the farms was formed by a small number of lactating animals, compromising the milk production and income. Therefore, practices must be developed to improve the calving interval, age at first calving and disposal criteria, which are factors that affect the structure of the herd.

The capital invested in the land area represented, on average, 52.79% of the fixed assets, which denotes the need for improvements in actions to increase the productivity of the land area factor, which depends on other intermediate indicators.

An increase in the productivity of the lactating cows per hectare is necessary, increasing the milk production per hectare, hence the importance of a structured herd and the attention to fodder production, including pasture.

The average productivity per lactating cow was consistent with the production system used, which was characterized by crossbred animals (1/2 to 7/8, Dutch x Zebu) and mid-level management (GLÓRIA et al., 2006), and was higher than the average productivity of samples evaluated in other regions (FASSIO et al., 2006; OLIVEIRA, et al., 2007; CAMILO NETO et al., 2012). However, this production would be higher, since 7/8 animals, for example, would respond more efficiently if a better environment was provided to them.

The average value for the ratio lactating cows by total cows was low compared to the overall rate of 83%. This index is an indicator that is influenced by the lactation period and calving intervals, which may be affected by genetic and environmental factors, and especially by the feeding and reproductive managements.

Despite below the reference value, this indicator showed that the herds of the Pernambuco Agreste region had a better reproductive efficiency compared to samples evaluated in the state of Minas Gerais (54.73%) (FASSIO et al., 2006) and Southern Bahia State (57.47%) (OLIVEIRA et al., 2007).

On average, the percentage of lactating cows in relation to the total amount of cattle was considered low. This is an indicator affected by calving interval, lactation, age at first calving and disposal. Thus, the higher the ratio, the greater the percentage of animals generating incomes. According to Gomes (2000), the percentage of an efficient production systems for this indicator are around 60%, with at least 40%. However, the rearing of males was performed in 50% of the farms (Table 1) as a form of economic reserves, contributing to reduce the percentage of dairy cows in the total herd.

The average amount of lactating cows per hectare and land area productivity was low (0.52), showing a small concern for the production per area. There is no reference value for these indicators, however, once adjusted to the costs, the higher, the better the economic results. Gomes (2000) found at least one lactating cow per hectare in efficient milk production systems in Minas Gerais.

The average value of 0.52 of lactating cows per hectare was considered reasonable, taking into account the soil and climatic conditions of the region and the difficulty for fodder production due to the low precipitations during the study period, which were 202.50 mm (São Bento do Una), 312.60 mm (Águas Belas) and 431.10 mm (Garanhuns), figures below the averages of the Pernambuco Agreste region, due to a drought period in the region (APAC, 2013).

The productivity of labor (Table 2) was one of the lowest in Brazil (LOPES et al., 2006; OLIVEIRA et al., 2007; CAMILO NETO et al., 2012). According to Gomes (2005), as the labor becomes scarce, this indicator increase in importance. Gomes (2000) found a labor productivity in efficient farms of a central cooperative in Minas Gerais of at least 150 (manual milking) and 250 (mechanical milking) liters of milk per day per person. Thus, this indicator must be increased in the production systems of the Agreste region.

The share of the milk gross income in relation to the gross income of the activity was used to separate the cost of the milk and the cost of the activity (Table 3). Camilo Neto et al. (2012), considering the SEBRAE Educampo Project, reported that the income from the milk was 70.1 to 80% of the income of the activity in balanced production systems, producing 8.1 to 12 liters per lactating cow per day (range in which the evaluated samples of the present study are found), results that are within the recommended rates.

The expenses with concentrate feed in relation to the milk gross income is an important indicator of economic efficiency. The economic balance of the production systems showed that the percentage of this indicator was high compared to the reference value of 30% recommended by Gomes (2000) to high productive herds, and also higher than that found by Camilo Neto et al. (2012) and Oliveira et al. (2007), possibly because this is the most supplied food to the animals, since the fodder supply is compromised, denoting the need for assessments on the use of concentrate in production systems of the Pernambuco Agreste region.

The average expenses with hired labor in relation to the milk gross income was low, however it is not an indicator of efficiency, since the family labor is not included in the calculation of the effective operational cost of milk due to methodology issues.

On average, the participation of the effective operational cost (EOC), total operating cost (TOC) and total cost (TC) in the milk prices were high, for which the SEBRAE Educampo Project recommends 65, 75 and 85%, respectively (CAMILO NETO et al., 2012). The expense of the milk income was higher than it is recommended to pay the TOC and TC, thus, with no adequately remunerating the family labor and return rate on invested capital in the activity.

On average, the gross margin was positive and the net margin negative, indicating a tendency to devaluation of the assets, inadequate remuneration of family labor, and input of external capital for replacement of the assets. The amount of CRR (-1.30) was zero, indicating that the return rate is below the opportunity interest. The systems can manage pay the monthly costs in short and medium term, however, this situation is unsustained in the long term, and some producers may leave the activity.

The average capital invested in the activity in relation to the daily milk production was high (R$ 2,809.38). Camilo Neto et al. (2012), considering the SEBRAE Educampo Project, indicated that this value should not exceed R$ 500.00 in the Southeast of Brazil. The capital invested in land area constituted most of the fixed assets of the evaluated systems, optimizing the indicators that are related to the land area factor, thus, the efficiency of use of the capital invested in the activity tends to increase.

Milk production systems located in Pernambuco Agreste region, on average, were not profitable or cost-effective. Low profitability and especially cost-effectiveness indicate that the activity in the period studied was not economically attractive and, in the long term, the farmers may migrate to other more attractive activities. Considering this information, the macroeconomic policies for sustainable regional development and the production systems should be reformulated from the zootechnical, economic and managerial point of view in order to make this activity attractive. However, profitable and cost-effective production systems were found in family and business farming, which can serve as a reference for the region.

The size indicators area for livestock, lactating cows, total cows and capital invested with land area; and the zootechnical indicators lactating cows by total cows, total cattle and area, had no correlation with the return rate on invested capital in the production systems (Table 4). This result indicates that the attractiveness of the activity is not dependent on the size of the system or the herd in the Pernambuco Agreste region, once the other production factors are balanced

The daily milk production was positively correlated (p=0.0005) with the cost-effectiveness, indicating the importance of the scale of production to determine the attractiveness of the activity in the region, as it has in most dairy production regions in Brazil (GOMES, 2005; LOPES et al., 2006; LOPES et al., 2008). The producers are probably operating in the economies of scale phase, in which the increase in production leads to a lower proportional increase in the total cost and, consequently, a higher proportional increase in the activity profit.

The positive correlation of CRR with milk production per area and with milk production per lactating cow (p<0.10) indicate that the increase in land area productivity is a way to increase the scale of production, increasing the milk production per lactating cow, since the indicator lactating cow per area was not correlated.

The technical indicator labor productivity, evaluated by the milk production per day per person, was correlated (p=0.0001) with CRR, thus, it is an important balance of cost-effectiveness, since labor productivity in the region is one of the lowest in Brazil.

In the costs composition, the hired or family labor expenses had a pronounced effect on the cost- effectiveness of the production systems. Thus, a greater attention to their training is recommended, and management practices that encourage increased productivity must be applied.

The economic indicators milk price, profitability and expenses with concentrate feed were positively correlated, while the EOC, TOC, TC per milk price, expenses with labor and concentrated feed per milk gross income and capital invested per liter of milk were negatively correlated (p<0.10) with the CRR.

In the formation of the milk price to be paid to the producer, the additions related to the volume has a great weighing to the industries, which in many cases is greater than the quality weighing, indicating a need to increase the scale of production in the evaluated systems. The destination of the informal milk production in the Pernambuco Agreste region is most the cheese production, occurring in the same system, thus, the amount of cheese sold in local markets, which is determined by the supply and demand is a balance point of the scale of production. The supply and demand can affect the price of the product in the formal market, however, it is not a limitation to the increase in the scale of production.

Profitability can be an important indicator of efficiency for decision making if used with caution, since it is easier to assess compared to the cost- effectiveness. Gomes (2000) found that the profitability could be higher than 25% in a sample of efficient producers in Minas Gerais, if the fixed assets were balanced.

The positive correlation of concentrate feed expenses with the CRR is possibly due to a more rational use in efficient systems, since all systems commonly use it to compensate the low availability of forage.

Negative correlations of the EOC, TOC and TC with CRR, although obvious, when quantified, became an important tool for the management of the production systems, setting limits to these costs in relation to the price of the milk to achieve cost- effectiveness, as well as the indicators labor and concentrate feed expenses in relation to the milk gross income, which are more important indicators than the absolute expenses.

The expenses on concentrate feed and permanent labor have the largest proportion in the composition of the EOC of milk in corporate farming, thus, the correlation with the cost- effectiveness allows to limit this expenses or searching for a cheaper feed source.

The daily milk production in the Pernambuco Agreste region is fragmented, similarly to the main dairy regions of the country. The areas sampled for evaluation were the ones most representative of the regional structure, thus, the dispersion of the data did not allow the quantification of all indicators (average milk production; labor productivity; expenses with labor and concentrated feed in relation to milk gross income; capital invested per liter of milk and expenses with concentrate feed) correlated with the CRR, since some equations developed were not significant (Table 5 and 6).

In the absence of the regression equation to quantify a benchmark of the scale of production for the evaluated systems, a leveling point can be used, which is the minimum daily milk production for a zero profit. This situation is considered normal because in this case the capital was paid according to the opportunity cost considered. Based on the average of the economic indicators of the sample studied (Table 2), the leveling point was 367 liters per day, which would be the minimum daily production for the capital to be paid at the rate of 6% per year considered in this work as the opportunity cost of the capital invested. This scale of production is about twice the average daily milk produced in the region (Table 2).

The milk production per lactating cow would need to increase by 17% for a return rate of 6% per year, compared to the average production found in the production systems (Table 2). Thus, improving the genetic quality of livestock (OLIVEIRA et al., 2001), and in short term, improvements in management and feeding practices is required, especially for the planning of fodder feeding.

Camilo Neto et al. (2012) found that 12, 13, 14 and 15 liters per lactating cow are needed for a return rate on invested capital of 6, 8, 10 and 12% per year, respectively, which is similar to the values found for this indicator in the present work.

The production per area should increase by 77% compared to the current average productivity (Table 2) for a return rate of 6% per year (Table 6), denoting the importance of this indicator for a more attractive dairy farming in the Pernambuco Agreste region.

Although the study has indicated a more important contribution of productivity per lactating cow for improving land area productivity, the increase number of dairy cows per hectare must be considered (Table 2). Double the average number of dairy cows per hectare, from the current 0.5 to 1.0, is reaching the land area productivity for a return rate on invested capital of 6%.

The assessment on the indicator average price of milk showed that it is impossible to develop an attractive dairy business with prices lower than R$ 1.00 per liter, which is a major challenge for the economic sustainability of the activity in the region. In this case, the challenge is not to produce milk, but do it competitively with the other regions of Brazil.

The values of the EOC, TOC and TC indicate that the cost of the system should not exceed 60% of the monthly milk income for a rate of return rate of 6% per year, and that a family labor remuneration plus the devaluations can add to the cost no more than 15% of the monthly income of milk for a profitability of 25%, turning the activity more attractive. These values are similar to those found by Gomes (2000), for a sample of producers in Minas Gerais, higher than those observed by Oliveira et al. (2007) and lower than those observed by Camilo Neto et al. (2012), using the same return rate.

The profitability was similar to that found by Gomes (2000) for a return rate of 6% per year, for a sample of efficient producers in Minas Gerais. Camilo Neto et al. (2012) found a profitability of 15% for the same return rate, due to the difference in cost structures of the production systems of the samples evaluated. These differences denote the need for constant identification and quantification of the indicators by region, confirming the findings of Oliveira et al. (2007) and Camilo Neto et al. (2012).

This work was conducted during the time of one of the worst droughts ever recorded in the Northeastern Brazil, which certainly affected the results and shows the importance of this type of study, which should be replicated not only in time but also in space.

CONCLUSIONS

The productivity of production factors land area and animals had correlation with cost- effectiveness higher than the factors related to the capital and labor in cow milk production systems in the middle of the Pernambuco Agreste region, denoting the need for increase the scale of production through increases in land area productivity and milk production per lactating cow, since the indicator lactating cow per area was not correlated, objectives that can be achieved if the management and feeding practices were improved, with emphasis on the planning of fodder feed.

The fodder feeding was compromised by the prolonged drought, thus, this type of study should be repeated in another period using the same space.

The identification and quantification of benchmarks more correlated with the cost- effectiveness can assist in the identification of weak points of the dairy farming in the Agreste, turning it into a sustainable and competitive activity.

ACKNOWLEDGEMENTS

The authors thank the CAPES and CNPq for partial funding this research; the undergraduate (Animal Science) student and CNPq scholar Deivid Vinicius de Araujo for collaborating to the data collection, correction and tabulation; the professor Stefanie Alvarenga dos Santos for collaborating to the data analysis; and the professor Daniela Moreira de Carvalho for the suggestions in the writing of the master's thesis.

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• 1
  - Paper extracted from the master thesis of the first author, funded by CNPq and FACEPE.

Publication Dates

• Publication in this collection
  Jul-Sep 2016

History

• Received
  04 Aug 2014
• Accepted
  11 Apr 2016