MEL’NIK, V. L. Investigation of smoothness conditions on the boundary for the strong linear convexity of a domain. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 51, n. 12, p. 1710–1713, 1999. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4774. Acesso em: 7 apr. 2025.