@article{biagio_2014,  title={AN EVOLUTIONARY STUDY ON CROP PRODUCTION IN SMALL FARM SYSTEMS IN THE MID-WEST REGION OF BRAZIL BASED ON A LINEAR PROGRAMMING MODEL},  volume={34},  ISSN={0101-7438},  url={https://doi.org/10.1590/0101-7438.2014.034.02.0251},  DOI={10.1590/0101-7438.2014.034.02.0251},  number={2},  journal={Pesquisa Operacional},  publisher={Sociedade Brasileira de Pesquisa Operacional},  author={Biagio, Maria Amelia},  year={2014},  month={May},  pages={251–273} }