SAMOILENKO, Yu. S.; MOSKALEVA, Yu. P. Systems of $n$ subspaces and representations of $*$-algebras generated by projections. Methods of Functional Analysis and Topology, [S. l.], v. 12, n. 1, p. 57–73, 2006. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/302. Acesso em: 16 dec. 2025.