RYAZANOV, V. I. On compactness and metrizability of nuclear spaces of manifolds. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 50, n. 6, p. 830–837, 1998. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4894. Acesso em: 6 dec. 2025.