@article{02217508, title = {On the concepts of balls in a }, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {2005}, year = {2005}, pages = {133-141}, doi = {10.1155/IJMMS.2005.133}, zbl = {1083.54526}, language = {en}, url = {http://dml.mathdoc.fr/item/02217508} }
Naidu, S.V.R.; Rao, K.P.R.; Srinivasa Rao, N. On the concepts of balls in a . International Journal of Mathematics and Mathematical Sciences, Tome 2005 (2005) pp. 133-141. doi : 10.1155/IJMMS.2005.133. http://gdmltest.u-ga.fr/item/02217508/