@article{00697108, title = {On }, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {17}, year = {1994}, pages = {687-692}, doi = {10.1155/S0161171294000979}, zbl = {0809.54017}, language = {en}, url = {http://dml.mathdoc.fr/item/00697108} }
Kovár, Martin M. On . International Journal of Mathematics and Mathematical Sciences, Tome 17 (1994) pp. 687-692. doi : 10.1155/S0161171294000979. http://gdmltest.u-ga.fr/item/00697108/