Jha, Shalini, Prasun Das, and Sanghamitra Bandhyopadhyay. “Multitime Multiobjective Variational Problems via η-Approximation Method”. Yugoslav Journal of Operations Research 32, no. 1 (February 1, 2022): 61–86. Accessed August 25, 2025. https://yujor.erc.fon.bg.ac.rs/index.php/yujor/article/view/688.