SAMOILENKO, Yu. S.; ERSHOVA, Yu. On equiangular configurations of subspaces of a Hilbert space. Methods of Functional Analysis and Topology, [S. l.], v. 17, n. 1, p. 84–96, 2011. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/473. Acesso em: 16 dec. 2025.