[1] CORNER A. L. S.:
Every countable reduced torsion-free ring is an endomorphism ring. Proc. London N. S. (3) 13 (1963), 687.
MR 0153743
[3] FUCHS L.:
Infinite abelian groups I. Acad. Press 1970.
MR 0255673
[5] KULIKOV L.:
On the theory of abelian groups of arbitrary power. Mat. Sbornik 16 (1945), 129.
MR 0018180