1. S. S. Dragomir, J. Pečarić, and L. E. Persson, “Some inequalities of Hadamard type,” Soochow J. Math. 21 (3), 335–341 (1995).
2. S. S. Dragomir, “n-points inequalities of Hermite–Hadamard type for h-convex functions on linear spaces,” Armen. J. Math. 8 (1), 38–57 (2016).
3. S. Varošanec, “On h-convexity,” J.Math. Anal Appl. 326 (1), 303–311 (2007).
4. C. P. Niculescu and L. E. Persson, “Old and new on the Hermite–Hadamard inequality,” Real Anal. Exchange 29 (2), 663–685 (2004).
5. C. P. Niculescu and L. E. Persson, Convex Functions and Their Applications. A Contemporary Approach, in CMS BooksMath. (Springer, New York, 2006), Vol. 23.