@article{vicente_2004,  title={Economic efficiency of agricultural production in Brazil},  volume={42},  ISSN={0103-2003},  url={https://doi.org/10.1590/S0103-20032004000200002},  DOI={10.1590/S0103-20032004000200002},  number={2},  journal={Revista de Economia e Sociologia Rural},  publisher={Sociedade Brasileira de Economia e Sociologia Rural (SOBER)},  author={Vicente, José R.},  year={2004},  month={Apr},  pages={201–222} }