VLASENKO, M. On the growth of algebra generated by a system of projections with fixed angles. Methods of Functional Analysis and Topology, [S. l.], v. 10, n. 1, p. 98–104, 2004. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/234. Acesso em: 17 dec. 2025.