@article{01143095, title = {On the representation of numbers by the direct sums of some binary quadratic forms.}, journal = {Georgian Mathematical Journal}, volume = {5}, year = {1998}, pages = {55-70}, doi = {10.1023/B:GEOR.0000008138.79410.d5}, zbl = {0890.11013}, language = {en}, url = {http://dml.mathdoc.fr/item/01143095} }
Kachakhidze, N. On the representation of numbers by the direct sums of some binary quadratic forms.. Georgian Mathematical Journal, Tome 5 (1998) pp. 55-70. doi : 10.1023/B:GEOR.0000008138.79410.d5. http://gdmltest.u-ga.fr/item/01143095/