LYUBICH, Yu. I. Dissipative actions and almost periodical representations of Abelian semigroups . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 40, n. 1, p. 70–74, 1987. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/9057. Acesso em: 7 dec. 2025.