VEREIKINA, M. B.; SHARKOVSKY, O. M. Tracing of pseudotrajectories of dynamical systems and stability of prolongations of orbits. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 49, n. 8, p. 1016–1024, 1997. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5096. Acesso em: 14 apr. 2025.