ALIKULOV, E. O. New differentiability criteria for complex-valued functions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 46, n. 4, p. 329–337, 1994. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5729. Acesso em: 18 dec. 2025.