SAFONOV, V. G. On the modularity of a lattice of τ-closed totally saturated formations of finite groups. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 58, n. 6, p. 852–858, 2006. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3501. Acesso em: 17 apr. 2025.