BESPALOV, Yu. N. Sets of orthoprojectors connected by correlations . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 44, n. 3, p. 309–317, 1992. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8099. Acesso em: 5 dec. 2025.