DZYUBENKO, H. A.; ZALIZKO, V. D. Coconvex Approximation of Functions with More than One Inflection Point. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 56, n. 3, p. 352–365, 2004. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3759. Acesso em: 11 apr. 2025.