@article{01852897, title = {Characterizations of projective and }, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {30}, year = {2002}, pages = {439-448}, doi = {10.1155/S0161171202109227}, zbl = {1013.16037}, language = {en}, url = {http://dml.mathdoc.fr/item/01852897} }
Al-Thani, Huda Mohammed J. Characterizations of projective and . International Journal of Mathematics and Mathematical Sciences, Tome 30 (2002) pp. 439-448. doi : 10.1155/S0161171202109227. http://gdmltest.u-ga.fr/item/01852897/