%0 Journal Article %A Takahiro Hayashi %T Sugawara operators and Kac-Kazhdan conjecture. %J Inventiones mathematicae %D 1988 %P 13-52 %V 94 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM_1988__94_2_143616/ %F IM_1988__94_2_143616