%0 Journal Article %A Vítězslav Kala %A Valentin Blomer %T On the Rank of Universal Quadratic Forms over Real Quadratic Fields %J Documenta mathematica %D 2018 %P 15-34 %V 23 %U http://geodesic.mathdoc.fr/articles/10.4171/dm/611/ %R 10.4171/dm/611 %F 10_4171_dm_611