DIAB, F. M. On the differential properties of continuous functions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 51, n. 8, p. 1122–1125, 1999. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4704. Acesso em: 5 dec. 2025.