@article{01054256, title = {Some properties and characterizations of }, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {20}, year = {1997}, pages = {503-510}, doi = {10.1155/S0161171297000689}, zbl = {0883.30024}, language = {en}, url = {http://dml.mathdoc.fr/item/01054256} }
Xiao, Jie. Some properties and characterizations of . International Journal of Mathematics and Mathematical Sciences, Tome 20 (1997) pp. 503-510. doi : 10.1155/S0161171297000689. http://gdmltest.u-ga.fr/item/01054256/