RABANOVYCH, V. I.; SAMOILENKO, Yu. S. Scalar Operators Representable as a Sum of Projectors. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 53, n. 7, p. 939–952, 2001. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4315. Acesso em: 5 dec. 2025.