@article{calôba_lins_2006,  title={Performance assessment of the soccer teams in Brazil using DEA},  volume={26},  ISSN={0101-7438},  url={https://doi.org/10.1590/S0101-74382006000300005},  DOI={10.1590/S0101-74382006000300005},  number={3},  journal={Pesquisa Operacional},  publisher={Sociedade Brasileira de Pesquisa Operacional},  author={Calôba, Guilherme Marques and Lins, Marcos Pereira Estellita},  year={2006},  month={Sep},  pages={521–536} }