Geodesic
New Hadamard's inequality for $\left( s_1,s_2\right)$-preinvex functions on co-ordinates
Kragujevac Journal of Mathematics, Tome 39 (2015) no. 2, p. 231 .

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In this paper the authors introduce a new classes of preinvexity called $\left( s_{1},s_{2}\right) $-preinvex functions on co-ordinates in the first and the second sense and establish some new Hermite-Hadamard type inequalities for those new concepts.
Classification : 26D15 26D20, 52A30
Keywords: Hermite-Hadamard inequality, co-ordinates preinvex, $\left(s_1;s_2\right) $-preinvex functions on co-ordinates 
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B. Meftah; K. Boukerrioua; T. Chiheb. New Hadamard's inequality for $\left( s_1,s_2\right)$-preinvex functions on co-ordinates. Kragujevac Journal of Mathematics, Tome 39 (2015) no. 2, p. 231 . http://geodesic.mathdoc.fr/item/KJM_2015_39_2_a10/