ROMANYUK, A. S. On Kolmogorov widths of classes $B^r_{p, \theta}$ of periodic functions of many variables with low smoothness in the space $L_q$. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 46, n. 7, p. 915–926, 1994. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5683. Acesso em: 14 apr. 2025.