@article{villanueva_linshu_dajun_2014,  title={Small Solid Propellant Launch Vehicle Mixed Design Optimization Approach},  volume={6},  ISSN={2175-9146},  url={https://doi.org/10.5028/jatm.v6i3.333},  DOI={10.5028/jatm.v6i3.333},  number={3},  journal={Journal of Aerospace Technology and Management},  publisher={Departamento de Ciência e Tecnologia Aeroespacial},  author={Villanueva, Fredy Marcell and Linshu, He and Dajun, Xu},  year={2014},  month={Jul},  pages={291–300} }