RYBAK, O. V. Li–Yorke sensitivity for semigroup actions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 65, n. 5, p. 681–688, 2013. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2451. Acesso em: 5 dec. 2025.