@article{igue_schmidt_1962,  title={Estudo de fertilidade em solos da série pinhão},  volume={21},  ISSN={0006-8705},  url={https://doi.org/10.1590/S0006-87051962000100041},  DOI={10.1590/S0006-87051962000100041},  number={unico},  journal={Bragantia},  publisher={Instituto Agronômico de Campinas},  author={Igue, Kozen and Schmidt, Nélson C.},  year={1962},  pages={743–753} }