@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/