[1]
O. I. Stepanets, “Several statements for convex functions”,
Ukr. Mat. Zhurn.
, vol. 51, no. 5, pp. 688–702, May 1999, Accessed: Apr. 13, 2025. [Online]. Available:
https://umj.imath.kiev.ua/index.php/umj/article/view/4654