Geodesic
2-Divisible groups over $Z$
Matematičeskie zametki, Tome 19 (1976) no. 5, pp. 717-726 Cet article a éte moissonné depuis la source Math-Net.Ru

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In this paper we construct nontrivial 2-divisible groups over $Z$ which are isogenous to trivial groups and prove the following: \underline{THEOREM.} If the height h of a 2-divisible group $\{G^{(\nu)}\}$ over $Z$ is at most 4, then $\{G^{(\nu)}\}$ is isogenous to a trivial group. 
@article{MZM_1976_19_5_a6,
     author = {V. A. Abrashkin},
     title = {2-Divisible groups over~$Z$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {717--726},
     year = {1976},
     volume = {19},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1976_19_5_a6/}
}
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V. A. Abrashkin. 2-Divisible groups over $Z$. Matematičeskie zametki, Tome 19 (1976) no. 5, pp. 717-726. http://geodesic.mathdoc.fr/item/MZM_1976_19_5_a6/