RUKASOV, V. I.; STEPANETS, O. I. Approximation Properties of the de la Vallée-Poussin Method. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 54, n. 8, p. 1100–1125, 2002. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4150. Acesso em: 6 dec. 2025.