GORBACHUK, V. M.; GORBACHUK, M. L. Spaces of smooth and generalized vectors of the generator of an analytic semigroup and their applications. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 69, n. 4, p. 478–509, 2017. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1711. Acesso em: 5 dec. 2025.