BABENKO, V. F.; LIGUN, A. A. Generalization of some extremal properties of splines. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 47, n. 3, p. 403–407, 1995. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5430. Acesso em: 7 apr. 2025.