BEREZANSKY, Yu. M.; OSTOVSKY, V. L.; SAMOILENKO, Yu. S. Eigen-functions decomposition of commutated operators’ families and representations of commutational relations . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 40, n. 1, p. 106–109, 1987. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/9064. Acesso em: 6 dec. 2025.