Jayswal, A., Prasad, A. K., & Stancu-Minasian, I. (2013). On nonsmooth multiobjective fractional programming problems involving (p, r)− ρ −(η ,θ)- invex functions. Yugoslav Journal of Operations Research, 23(3), 367–386. https://doi.org/10.2298/YJOR130131012J