%0 Journal Article %A Meinhard Peters %T Sums of nine squares %J Acta Arithmetica %D 2002 %P 131-135 %V 102 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa102-2-2/ %R 10.4064/aa102-2-2 %G en %F 10_4064_aa102_2_2