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@article{IM_1968__5_141924, author = {F. OORT and D. MUMFORD}, title = {Deformations and {Liftings} of {Finite,} {Commutative} {Group} {Schemes.}}, journal = {Inventiones mathematicae}, pages = {317--334}, publisher = {mathdoc}, volume = {5}, year = {1968}, zbl = {0179.49901}, url = {http://geodesic.mathdoc.fr/item/IM_1968__5_141924/} }
F. OORT; D. MUMFORD. Deformations and Liftings of Finite, Commutative Group Schemes.. Inventiones mathematicae, Tome 5 (1968), pp. 317-334. http://geodesic.mathdoc.fr/item/IM_1968__5_141924/