Geodesic
Determination of the direct sums of rational groups by $H$-representations of the endomorphism rings up to equality
Fundamentalʹnaâ i prikladnaâ matematika, Tome 17 (2012) no. 8, pp. 95-103

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The problem of determination of Abelian groups (up to isomorphism) by their rings of endomorphisms in the class of completely decomposable torsion-free Abelian groups has been solved earlier. For the class of direct sums of rational groups one can speak about determination of Abelian groups by rational representations of their endomorphism rings up to equality. In this paper, we consider this problem for the class of finite direct sums of rational groups and for some subclasses. 
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     author = {E. N. Kurmanova and A. M. Sebeldin},
     title = {Determination of the direct sums of rational groups by $H$-representations of the endomorphism rings up to equality},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
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E. N. Kurmanova; A. M. Sebeldin. Determination of the direct sums of rational groups by $H$-representations of the endomorphism rings up to equality. Fundamentalʹnaâ i prikladnaâ matematika, Tome 17 (2012) no. 8, pp. 95-103. http://geodesic.mathdoc.fr/item/FPM_2012_17_8_a10/