SAMOILENKO, Yu. S.; STRELETS, A. V. On "good" vectors for family of unbounded operators and their application. Methods of Functional Analysis and Topology, [S. l.], v. 8, n. 2, p. 88–100, 2002. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/186. Acesso em: 17 dec. 2025.