@article{01780409, title = {Optimal bound for the number of }, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {30}, year = {2002}, pages = {123-126}, doi = {10.1155/S0161171202013194}, zbl = {1043.14009}, language = {en}, url = {http://dml.mathdoc.fr/item/01780409} }
Lahyane, Mustapha. Optimal bound for the number of . International Journal of Mathematics and Mathematical Sciences, Tome 30 (2002) pp. 123-126. doi : 10.1155/S0161171202013194. http://gdmltest.u-ga.fr/item/01780409/