[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