Lupşa, Liana, and Gabriela Cristescu. “Some Concepts of Generalized Convex Functions (I)”. Rev. Anal. Numér. Théor. Approx. 31, no. 2 (August 1, 2002): 171–177. Accessed May 3, 2024. https://ictp.acad.ro/jnaat/journal/article/view/2002-vol31-no2-art7.