Oort, FransMumford, David2010-01-281968Oort, Frans, and David B. Mumford. 1968. Deformations and liftings of finite, commutative group scheme. Inventiones Mathematicae 5(4): 317-334.0020-99101432-1297http://nrs.harvard.edu/urn-3:HUL.InstRepos:3597249en-USDeformations and Liftings of Finite, Commutative Group SchemeJournal Article2010-01-2810.1007/BF01389779