Geodesic
On some classes of Hopfian Abelian groups and modules
Fundamentalʹnaâ i prikladnaâ matematika, Tome 20 (2015) no. 5, pp. 61-68.

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The Hopficity property in a well-known class of Abelian groups—completely decomposable torsion-free groups, as well as in a class of modules over generalized matrix rings is studied. Examples of non-Hopfian completely decomposable torsion-free group are constructed. 
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E. V. Kaigorodov; P. A. Krylov. On some classes of Hopfian Abelian groups and modules. Fundamentalʹnaâ i prikladnaâ matematika, Tome 20 (2015) no. 5, pp. 61-68. http://geodesic.mathdoc.fr/item/FPM_2015_20_5_a6/

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