@article{02220798, title = {Lagrange, central norms, and quadratic Diophantine equations.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {2005}, year = {2005}, pages = {1039-1047}, doi = {10.1155/IJMMS.2005.1039}, zbl = {1087.11015}, language = {en}, url = {http://dml.mathdoc.fr/item/02220798} }
Mollin, R.A. Lagrange, central norms, and quadratic Diophantine equations.. International Journal of Mathematics and Mathematical Sciences, Tome 2005 (2005) pp. 1039-1047. doi : 10.1155/IJMMS.2005.1039. http://gdmltest.u-ga.fr/item/02220798/