%0 Journal Article %A B. Meftah %A K. Boukerrioua %A T. Chiheb %T New Hadamard's inequality for $\left( s_1,s_2\right)$-preinvex functions on co-ordinates %J Kragujevac Journal of Mathematics %D 2015 %P 231 %V 39 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/KJM_2015_39_2_a10/ %G en %F KJM_2015_39_2_a10