KULIK, V. L.; STEPANENKO, N. V. On Regularity of Certain Linear Expansions of Dynamical Systems on a Torus. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 54, n. 4, p. 568–574, 2002. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4094. Acesso em: 5 dec. 2025.