PRYMAK, A. V. Shape-Preserving Smoothing of 3-Convex Splines of Degree 4. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 57, n. 2, p. 277–283, 2005. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3596. Acesso em: 6 dec. 2025.