AFANAS'EVA, E. S. On the Boundary Behavior of One Class of Mappings in Metric Spaces. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 66, n. 1, p. 17–29, 2014. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2107. Acesso em: 14 apr. 2025.