@article{04171283, title = {On }, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {13}, year = {1990}, pages = {287-293}, doi = {10.1155/S0161171290000424}, zbl = {0712.30011}, language = {en}, url = {http://dml.mathdoc.fr/item/04171283} }
Ma, Wancang. On . International Journal of Mathematics and Mathematical Sciences, Tome 13 (1990) pp. 287-293. doi : 10.1155/S0161171290000424. http://gdmltest.u-ga.fr/item/04171283/