%0 Journal Article %A Lusztig, G. %T Study of a 𝐙-form of the coordinate ring of a reductive group %J Journal of the American Mathematical Society %D 2009 %P 739-769 %V 22 %N 3 %U http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-08-00603-6/ %R 10.1090/S0894-0347-08-00603-6 %F 10_1090_S0894_0347_08_00603_6