HLADYSH, B. I.; PRISHLYAK, O. O. Deformations in the general position of the optimal functions on oriented surfaces with boundary. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 71, n. 8, p. 1028–1039, 2019. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1495. Acesso em: 5 dec. 2025.