@article{IM2_1977_11_5_a1,
     author = {V. A. Abrashkin},
     title = {$p$-divisible groups over~$\mathbf Z$},
     journal = {Izvestiya. Mathematics},
     pages = {937--956},
     year = {1977},
     volume = {11},
     number = {5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1977_11_5_a1/}
}