@article{05030011, title = {On }, journal = {Novi Sad Journal of Mathematics}, volume = {33}, year = {2003}, pages = {43-48}, zbl = {1090.53033}, language = {en}, url = {http://dml.mathdoc.fr/item/05030011} }
De, U.C.; Shaikh, A.A.; Biswas, Sudipta. On . Novi Sad Journal of Mathematics, Tome 33 (2003) pp. 43-48. http://gdmltest.u-ga.fr/item/05030011/