GRECHKO, A. L. On necessary conditions for the weak regularity of a linear extension of a dynamical system on a torus. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 50, n. 3, p. 424–425, 1998. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4942. Acesso em: 11 apr. 2025.