OJHA, D. B. On second- order symmetric duality for a class of multiobjective fractional programming problem. Tamkang Journal of Mathematics, [S. l.], v. 43, n. 2, p. 267–279, 2012. DOI: 10.5556/j.tkjm.43.2012.1183. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/1183. Acesso em: 4 jul. 2022.