@article{05054223, title = {Some properties of }, journal = {Divulgaciones Matem\'aticas}, volume = {12}, year = {2004}, pages = {161-169}, zbl = {1099.54501}, language = {en}, url = {http://dml.mathdoc.fr/item/05054223} }
Caldas, M.; Jafari, S.; Kovár, M.M. Some properties of . Divulgaciones Matemáticas, Tome 12 (2004) pp. 161-169. http://gdmltest.u-ga.fr/item/05054223/