SERDYUK, A. S.; STEPANYUK, T. A. Estimations of the Best Approximations for the Classes of Infinitely Differentiable Functions in Uniform and Integral Metrics. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 66, n. 9, p. 1244–1256, 2014. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2215. Acesso em: 5 dec. 2025.