@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/