SEMKO, N. N. Structure of locally graded CDN (]-groups. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 50, n. 11, p. 1532–1536, 1998. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4805. Acesso em: 14 apr. 2025.