%0 Journal Article %A James G. Huard %A Kenneth S. Williams %T Sums of twelve squares %J Acta Arithmetica %D 2003 %P 195-204 %V 109 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa109-2-7/ %R 10.4064/aa109-2-7 %G en %F 10_4064_aa109_2_7