Rayanki V, Kummari K. Necessary and Sufficient Optimality Conditions for Fractional Interval-Valued Variational Problems. YUJOR [Internet]. 2022 Nov. 22 [cited 2025 Dec. 16];33(2):199-231. Available from: https://yujor.erc.fon.bg.ac.rs/index.php/yujor/article/view/730