Erhan Set, Mehmet Zeki Sarikaya and Ahmet Ocak Akdemir
 G. Cristescu and L. Lupsa, Non-connected convexities and applications, Kluwer Academic
Publishers Dordrecht / Boston / London, 2002.
 G. Cristescu, Hadamard type inequalities for φ-convex functions, Annals of the University of
Oradea, Fascicle of Management and Technological Engineering, C-Rom Edition, III (XIII),
 M.K. Bakula and J. Pecaric, Note on some Hadamard-type inequalities, Journal of Inequalities
in Pure and Applied Mathematics, vol. 5, no. 3, article 74, 2004.
 S.S. Dragomir and C.E.M. Pearce, Selected Topics on