LOPOTKO, O. V. Representations of the additive group of a nuclear space in terms of self-adjoint operators. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 51, n. 2, p. 271–274, 1999. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4609. Acesso em: 5 dec. 2025.