YAKYMENKO, D. Yu. On indecomposable and transitive systems of subspaces. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 59, n. 5, p. 717–720, 2007. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3340. Acesso em: 5 dec. 2025.