GORBACHUK, V. I.; GORBACHUK, M. L. On one generalization of the Berezanskii evolution criterion for the self-adjointness of operators. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 52, n. 5, p. 608–615, 2000. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4455. Acesso em: 5 dec. 2025.