Bhati, D., and P. Singh. “Multi-Objective Nonlinear Sum of Fractional Optimization problems with Non-Convex Constraints Using Duality Based Branch and Bound Algorithm”. Ukrains’kyi Matematychnyi Zhurnal 69, no. 11 (November 25, 2017): 1455-1471. Accessed April 26, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/1795.