SUBBOTIN, Yu. N.; TELYAKOVSKII, S. A. On relative widths of classes of differentiable functions. II. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 62, n. 3, p. 423–431, 2010. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2877. Acesso em: 27 apr. 2025.