Gupta, Kavita, and S.R. Arora. “An Algorithm for Solving a Capacitated Indefinite Quadratic Transportation Problem With Enhanced Flow”. Yugoslav Journal of Operations Research 24, no. 2 (June 1, 2014): 217–236. Accessed August 26, 2025. https://yujor.erc.fon.bg.ac.rs/index.php/yujor/article/view/392.