@article{MZ_1992__210_1_174387,
     author = {C. Greither},
     title = {Extensions of finite group schemes, and {Hopf} {Galois} theory over a complete discrete valuation ring.},
     journal = {Mathematische Zeitschrift},
     pages = {37--68},
     publisher = {mathdoc},
     volume = {210},
     number = {1},
     year = {1992},
     zbl = {0737.11038},
     url = {http://geodesic.mathdoc.fr/item/MZ_1992__210_1_174387/}
}