Pečarić, Josip, and Sanja Varošanec. “On Convexity-Like Inequalities (II)”. Rev. Anal. Numér. Théor. Approx. 32, no. 1 (February 1, 2003): 79–84. Accessed May 3, 2024. https://ictp.acad.ro/jnaat/journal/article/view/2003-vol32-no1-art9.