BABENKO , V. F. The best approximations of the classes of functions preset by means of the continuity modulus. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 44, n. 5, p. 579–589, 1992. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/7952. Acesso em: 14 apr. 2025.