Geodesic
Complete direct sums of Abelian torsion-free groups of rank 1 with isomorphic groups or rings of endomorphisms. I
Matematičeskie zametki, Tome 14 (1973) no. 6, pp. 867-878 
A. M. Sebel'din. Complete direct sums of Abelian torsion-free groups of rank 1 with isomorphic groups or rings of endomorphisms. I. Matematičeskie zametki, Tome 14 (1973) no. 6, pp. 867-878. http://geodesic.mathdoc.fr/item/MZM_1973_14_6_a11/
@article{MZM_1973_14_6_a11,
     author = {A. M. Sebel'din},
     title = {Complete direct sums of {Abelian} torsion-free groups of rank 1 with isomorphic groups or rings of endomorphisms. {I}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {867--878},
     year = {1973},
     volume = {14},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1973_14_6_a11/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

Isomorphism conditions are established for torsion-free Abelian groups with isomorphic groups or rings of endomorphisms decomposable into complete direct sums of groups of rank 1.