POLYAKOV, O. V. Approximation of certain classes of differentiable functions by generalized splines. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 49, n. 7, p. 951–957, 1997. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5086. Acesso em: 11 apr. 2025.