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@article{IM_1988__92_1_143583, author = {Anthony Joseph}, title = {A surjectivity theorem for rigid highest weight modules.}, journal = {Inventiones mathematicae}, pages = {567--596}, publisher = {mathdoc}, volume = {92}, number = {1}, year = {1988}, zbl = {0657.17004}, url = {http://geodesic.mathdoc.fr/item/IM_1988__92_1_143583/} }
Anthony Joseph. A surjectivity theorem for rigid highest weight modules.. Inventiones mathematicae, Tome 92 (1988) no. 1, pp. 567-596. http://geodesic.mathdoc.fr/item/IM_1988__92_1_143583/