PRISHLYAK, O. O. Topological Equivalence of Morse–Smale Vector Fields with beh2 on Three-Dimensional Manifolds. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 54, n. 4, p. 492–500, 2002. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4087. Acesso em: 5 dec. 2025.