@article{IM_1988__94_2_143616,
     author = {Takahiro Hayashi},
     title = {Sugawara operators and {Kac-Kazhdan} conjecture.},
     journal = {Inventiones mathematicae},
     pages = {13--52},
     publisher = {mathdoc},
     volume = {94},
     number = {2},
     year = {1988},
     zbl = {0674.17005},
     url = {http://geodesic.mathdoc.fr/item/IM_1988__94_2_143616/}
}