1. Exame. Exame Melhores e Maiores [Exame Best and Biggest]. São Paulo: Abril. 1044E. ed.; 2013.
2. Fuzzy sets;Zadeh;Information and Control,1965
3. Gomes, L.F.A.M., Gomes, C.F.S. Tomada de decisão gerencial: enfoque multicritério [Management decision-making: multi- criterion approach]. 4th ed. São Paulo: Atlas; 2012.
4. Rough sets;Pawlak;Communications of the ACM,1995
5. Blaszczynski, J., Greco, S., Matarazzo, B., Slowinski, R., Szeląg, M. jMAF. Institute of Computer Science. Poznan University of Technology, Poland. Available from: http://www.cs.put.poznan.pl/jblaszczynski/Site/jRS.html; 2012.