@article{04097726,
title = {On },
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {12},
year = {1989},
pages = {107-112},
doi = {10.1155/S0161171289000141},
zbl = {0671.30011},
language = {en},
url = {http://dml.mathdoc.fr/item/04097726}
}
Chen, Ming-Po; Lan, Lh-Ren. On . International Journal of Mathematics and Mathematical Sciences, Tome 12 (1989) pp. 107-112. doi : 10.1155/S0161171289000141. http://gdmltest.u-ga.fr/item/04097726/