Cyclic Purity and Cocyclic Copurity in Module Categories. Journal of International Academy of Physical Sciences, [S. l.], v. 4, n. 1-4, p. 5–10, 2000. Disponível em: http://www.iaps.org.in/journal/index.php/journaliaps/article/view/723. Acesso em: 23 oct. 2026.