1. Yu. B. Dobrusin, “Quasipure injective groups,” in:Abelian Groups and Modules [in Russian], Tomsk (1979), pp. 45–63.
2. Yu. B. Dobrusin, “Torsion free quasipure injective Abelian groups,” in:Abelian Groups and Modules [in Russian], Tomsk (1980), pp. 45–69.
3. D. M. Arnold, O’Brien, and J. D. Reid, “Quasi-pure injective and projective torsion-free abelian groups of finite rank,”Proc. London Math. Soc.,38, No. 3, 532–544 (1979).
4. P. A. Krylov, “Some examples of quasipure injective and transitive torsion-free Abelian groups,” in:Abelian Groups and Modules. 7 [in Russian], Tomsk (1988), pp. 81–99.
5. A. R. Chekhlov, “Quasipure injective torsion-free Abelian groups,”Mat. Zametki [Math. Notes],46, No. 3, 93–99 (1989).