Geodesic
Isogenies and torsion of elliptic curves
Izvestiya. Mathematics , Tome 4 (1970) no. 2, pp. 415-430

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In this paper we prove the uniform boundedness of the set of isogenies of certain classes of elliptic curves. The result obtained is applied to estimate the sum of exponents of torsion. 
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     author = {A. N. Parshin},
     title = {Isogenies and torsion of elliptic curves},
     journal = {Izvestiya. Mathematics },
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     number = {2},
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     url = {http://geodesic.mathdoc.fr/item/IM2_1970_4_2_a8/}
}
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A. N. Parshin. Isogenies and torsion of elliptic curves. Izvestiya. Mathematics , Tome 4 (1970) no. 2, pp. 415-430. http://geodesic.mathdoc.fr/item/IM2_1970_4_2_a8/