SAFAEI, Nemat; SARAJ, Mansour. Fuzzy linear fractional bi-level multi-objective programming problems. International Journal of Applied Mathematical Research, [S. l.], v. 1, n. 4, p. 643–658, 2012. DOI: 10.14419/ijamr.v1i4.416. Disponível em: https://www.sciencepubco.com/index.php/ijamr/article/view/416.. Acesso em: 3 may. 2024.