PRISHLYAK, O. O. Topological Classification of m-Fields on Two- and Three-Dimensional Manifolds with Boundary. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 55, n. 6, p. 799–805, 2003. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3954. Acesso em: 5 dec. 2025.