DIAB, F. M. On directional monogeneity sets. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 49, n. 4, p. 517–522, 1997. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5025. Acesso em: 5 dec. 2025.