%0 Journal Article %A Claus Scheiderer %T Sums of squares of polynomials with rational coefficients %J Journal of the European Mathematical Society %D 2016 %P 1495-1513 %V 18 %N 7 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4171/jems/620/ %R 10.4171/jems/620 %F JEMS_2016_18_7_a2