Geodesic
On homomorphisms of Abelian schemes
Izvestiya. Mathematics , Tome 10 (1976) no. 4, pp. 731-747.

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In this paper we consider homomorphisms of abelian schemes $\pi_i\colon X_i \to S$ ($i=1,2$) over a connected smooth algebraic curve $S$ defined over the field of complex numbers. We prove that under certain natural conditions the canonical map $$ \operatorname{Hom}_S(X_1,X_2)\to\operatorname{Hom}(R_1\pi_{1*}Z,R_1\pi_{2*}Z) $$ is an isomorphism. Bibliography: 5 titles. 
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     author = {S. G. Tankeev},
     title = {On homomorphisms of {Abelian} schemes},
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     number = {4},
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S. G. Tankeev. On homomorphisms of Abelian schemes. Izvestiya. Mathematics , Tome 10 (1976) no. 4, pp. 731-747. http://geodesic.mathdoc.fr/item/IM2_1976_10_4_a3/

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