MAKSIMENKO, S. I. Classification ofm-functions on surfaces. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 51, n. 8, p. 1129–1135, 1999. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4706. Acesso em: 5 dec. 2025.