@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/