ENGEL, Olga; SZÁSZ, Róbert. On a subclass of convex functions. Studia Universitatis Babeș-Bolyai Mathematica, [S. l.], v. 61, n. 2, p. 137–146, 2016. Disponível em: https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/5540. Acesso em: 19 apr. 2025.