Jha, Shalini, Prasun Das, and Tadeusz Antczak. “Exponential Type Duality for η-Approximated Variational Problems”. Yugoslav Journal of Operations Research 30, no. 1 (February 1, 2020): 19–43. Accessed August 28, 2025. https://yujor.erc.fon.bg.ac.rs/index.php/yujor/article/view/607.