MOTORNAYA, O. V.; MOTORNYI, V. P. Comparison theorems for some nonsymmetric classes of functions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 60, n. 7, p. 969–975, 2008. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3212. Acesso em: 14 apr. 2025.