PRISHLYAK, A. O. On topologically equivalent Morse functions on 3-manifold. Methods of Functional Analysis and Topology, [S. l.], v. 5, n. 3, p. 49–53, 1999. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/98. Acesso em: 17 dec. 2025.