VLASENKO, Igor. On the relations on the set of heteroclinic points of Morse-Smale diffeomorphisms on 2-manifolds. Methods of Functional Analysis and Topology, [S. l.], v. 5, n. 3, p. 90–96, 1999. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/101. Acesso em: 17 dec. 2025.