%0 Journal Article %A F. Ellison %T Three diagonal quadratic forms %J Acta Arithmetica %D 1973 %P 137-151 %V 23 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa-23-2-137-151/ %R 10.4064/aa-23-2-137-151 %G en %F 10_4064_aa_23_2_137_151