GORBACHUK, E. L.; MATURIN, Yu. P. $I$-Radicals, Their Lattices, and Some Classes of Rings. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 54, n. 7, p. 1016–1019, 2002. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4141. Acesso em: 6 dec. 2025.