@article{AA_1989_1_1_a1,
     author = {V. A. Abrashkin},
     title = {Group schemes over a~discrete valuation ring with small ramification},
     journal = {Algebra i analiz},
     pages = {60--95},
     publisher = {mathdoc},
     volume = {1},
     number = {1},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_1989_1_1_a1/}
}