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@article{IM_1985__79_143217, author = {J.T. Stafford}, title = {Non-holonomic modules over {Weyl} algebras and enveloping algebras.}, journal = {Inventiones mathematicae}, pages = {619--638}, publisher = {mathdoc}, volume = {79}, year = {1985}, zbl = {0558.17011}, url = {http://geodesic.mathdoc.fr/item/IM_1985__79_143217/} }
J.T. Stafford. Non-holonomic modules over Weyl algebras and enveloping algebras.. Inventiones mathematicae, Tome 79 (1985), pp. 619-638. http://geodesic.mathdoc.fr/item/IM_1985__79_143217/