@article{05662358, title = {On (}, journal = {Bulletin of the Malaysian Mathematical Sciences Society. Second Series}, volume = {33}, year = {2010}, pages = {57-67}, zbl = {1188.03052}, language = {en}, url = {http://dml.mathdoc.fr/item/05662358} }
Zhan, Jianming; Jun, Young Bae; Dudek, Wiesław A. On (. Bulletin of the Malaysian Mathematical Sciences Society. Second Series, Tome 33 (2010) pp. 57-67. http://gdmltest.u-ga.fr/item/05662358/