Lopushansky О. V. Continuous semigroups in locally convex algebras. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 43, n. 2, p. 154–158, 2025. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/9349. Acesso em: 6 dec. 2025.