DOKUCHAEV, M. A.; KIRICHENKO, V. V. Quasi-Frobenius Rings and Nakayama Permutations of Semiperfect Rings. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 54, n. 7, p. 919–930, 2002. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4128. Acesso em: 11 apr. 2025.