RAYANKI, Vivekananda; KUMMARI, Krishna. Necessary and Sufficient Optimality Conditions for Fractional Interval-Valued Variational Problems. Yugoslav Journal of Operations Research, [S. l.], v. 33, n. 2, p. 199–231, 2022. DOI: 10.2298/YJOR210815028R. Disponível em: https://yujor.erc.fon.bg.ac.rs/index.php/yujor/article/view/730. Acesso em: 26 aug. 2025.