HASSI, S.; DERKACH, V. A.; DE SNOO, H.; MALAMUD, M. M. Generalized resolvents of symmetric operators and admissibility. Methods of Functional Analysis and Topology, [S. l.], v. 6, n. 3, p. 24–55, 2000. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/124. Acesso em: 17 dec. 2025.