%0 Journal Article %A Harris, Michael %T 𝐿-functions of 2×2 unitary groups and factorization of periods of Hilbert modular forms %J Journal of the American Mathematical Society %D 1993 %P 637-719 %V 06 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-1993-1186960-7/ %R 10.1090/S0894-0347-1993-1186960-7 %F 10_1090_S0894_0347_1993_1186960_7