%0 Journal Article %A Vivekananda Rayanki %A Krishna Kummari %T Necessary and sufficient optimality conditions for fractional interval-valued variational problems %J Yugoslav journal of operations research %D 2023 %P 199 %V 33 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/YJOR_2023_33_2_a1/ %G en %F YJOR_2023_33_2_a1