Geodesic
Endomorphism rings of rigid almost completely decomposable Abelian groups
Fundamentalʹnaâ i prikladnaâ matematika, Tome 17 (2012) no. 7, pp. 31-47.

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A necessary and sufficient condition is found for rigid almost completely decomposable Abelian groups with $p$-primary regulator quotients to have endomorphism rings isomorphic to those of the corresponding groups with cyclic regulator quotients. 
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E. A. Blagoveshchenskaya. Endomorphism rings of rigid almost completely decomposable Abelian groups. Fundamentalʹnaâ i prikladnaâ matematika, Tome 17 (2012) no. 7, pp. 31-47. http://geodesic.mathdoc.fr/item/FPM_2012_17_7_a2/

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