BEREZOVSKY, N. I.; LINCHUK, S. S. On the commutant of a multiplication operator and conditions of invertibility of its elements. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 45, n. 1, p. 21–25, 1993. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5777. Acesso em: 5 dec. 2025.