TIKHONOV, S. Yu. On the Equivalence of Some Conditions for Convex Functions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 57, n. 3, p. 427–431, 2005. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3610. Acesso em: 11 apr. 2025.