Geodesic
$p$-divisible groups over~$\mathbf Z$
Izvestiya. Mathematics , Tome 11 (1977) no. 5, pp. 937-956

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In this paper it is shown that: a) there do not exist 3-dimensional abelian varieties over $\mathbf Q$ having everywhere good reduction: b) every 2-divisible group over $\mathbf Z$ of height $\leqslant6$ is isogenous to the trivial one; c) for irregular primes $p$ there exist nontrivial $p$-divisible groups over $\mathbf Z$. Bibliography: 6 titles. 
@article{IM2_1977_11_5_a1,
     author = {V. A. Abrashkin},
     title = {$p$-divisible groups over~$\mathbf Z$},
     journal = {Izvestiya. Mathematics },
     pages = {937--956},
     publisher = {mathdoc},
     volume = {11},
     number = {5},
     year = {1977},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1977_11_5_a1/}
}
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V. A. Abrashkin. $p$-divisible groups over~$\mathbf Z$. Izvestiya. Mathematics , Tome 11 (1977) no. 5, pp. 937-956. http://geodesic.mathdoc.fr/item/IM2_1977_11_5_a1/