@article{01779097, title = {An }, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {30}, year = {2002}, pages = {31-37}, doi = {10.1155/S016117120200697X}, zbl = {1001.47023}, language = {en}, url = {http://dml.mathdoc.fr/item/01779097} }
Sulaiman, W.T. An . International Journal of Mathematics and Mathematical Sciences, Tome 30 (2002) pp. 31-37. doi : 10.1155/S016117120200697X. http://gdmltest.u-ga.fr/item/01779097/