S. ABBAS, M. Purity And Projectivity Relative To A Submodule. IRAQI JOURNAL OF STATISTICAL SCIENCES, [S. l.], v. 13, n. 3, p. 49–63, 2013. DOI: 10.33899/iqjoss.2013.081289. Disponível em: https://tanmiyat.uomosul.edu.iq/index.php/stats/article/view/29328. Acesso em: 6 sep. 2025.