1. N. Bourbaki, Groupes et Algébres de Lie, Hermann, Paris (1971, 1972).
2. A. R. Chekhlov, “Intersection of direct summands of Abelian p-groups,” in: Abelian Groups and Modules, Tomsk (1981), pp. 240–244.
3. A. R. Chekhlov, “On some classes of Abelian groups,” in: Abelian Groups and Modules, Tomsk (1984), pp. 137–152.
4. A. R. Chekhlov, “On torsion-free Abelian groups close to quasi-pure-injective ones,” in: Abelian Groups and Modules, Tomsk (1985), pp. 117–127.
5. A. R. Chekhlov, “On quasipure-injective Abelian torsion-free groups,” Izv. Vyssh. Uchebn. Zaved., Mat., No. 6, 80–83 (1988).