Sharkоvskу A. N. Behaviour of a mapping in the vicinity of an attracting set . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 18, n. 2, p. 60–83, 1966. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8717. Acesso em: 6 dec. 2025.