HUSSEIN, S. E. D. S.; RADWAN, A. E. L. A. A. ON THE PROJECTIVE GREEN RING. Tamkang Journal of Mathematics, [S. l.], v. 28, n. 1, p. 39–45, 1997. DOI: 10.5556/j.tkjm.28.1997.4332. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4332. Acesso em: 29 apr. 2024.