@article{GDZPPN002087146, title = {Deformations and Liftings of Finite, Commutative Group Schemes.}, journal = {Inventiones mathematicae}, volume = {5}, year = {1968}, pages = {317-334}, zbl = {0179.49901}, url = {http://dml.mathdoc.fr/item/GDZPPN002087146} }
OORT, F.; MUMFORD, D. Deformations and Liftings of Finite, Commutative Group Schemes.. Inventiones mathematicae, Tome 5 (1968) pp. 317-334. http://gdmltest.u-ga.fr/item/GDZPPN002087146/