YAKYMENKO, D. Yu.; SAMOILENKO, Yu. S. On $n$-tuples of subspaces in linear and unitary spaces. Methods of Functional Analysis and Topology, [S. l.], v. 15, n. 1, p. 48–60, 2009. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/408. Acesso em: 16 dec. 2025.