1. D. Arnold,
Finite Torsion-Free Abelian Groups and Rings,
Lecture Notes in Math. 931,
Springer, Berlin, 1982.
2. L. Fuchs,
Infinite Abelian Groups. Vol. I,
Academic Press, New York, 1970.
3. L. Fuchs,
Infinite Abelian Groups. Vol. II,
Academic Press, New York, 1973.
4. G. Călugăreanu, A. Chekhlov and P. Krylov,
Subgroups generated by images of endomorphisms of abelian groups and duality,
J. Group Theory 21 (2018), no. 5, 885–900.
5. P. Griffith,
Infinite Abelian Group Theory,
The University of Chicago Press, Chicago, 1970.