BOZHOK, R. V. On the defect of nondenseness of continuous imbeddings in the scale of Hilbert spaces. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 60, n. 5, p. 704–708, 2008. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3188. Acesso em: 11 apr. 2025.