Verma RU. The ϵ−Optimality conditions for multiple objective fractional programming problems for generalized (ρ, η)−invexity of higher order. CUBO [Internet]. 2012 Jun. 1 [cited 2024 May 18];14(2):01–13. Available from: https://cubo.ufro.cl/ojs/index.php/cubo/article/view/1339