1. R. G. Alizade, ?On inductively closed proper classes in the category of Abelian groups,? Inst. Mat. i Mekh. Akad. Nauk AzSSR, Baku (1982).
2. G. F. Bachurin, ?Schur multipliers of Abelian groups,? Mat. Zap. Ural. Univ..13, No. 3, 3?15 (1983).
3. I. Kh. Bekker, ?First homology groups over interdirect sums of torsion-free Abelian groups,? Tomsk. Univ., Tomsk (1979).
4. I. Kh. Bekker, ?Determinability of reduced torsion-free Abelian groups by their relative holomorphs,? in:?Abelian groups and modules,? Tomsk (1980), pp. 3?18.
5. I. Kh. Bekker, ?Torsion-free Abelian groups with torsion groups of automorphisms and first homology groups,? Selected from: Sib. Mat. Zh., Sibirskii Otdel Akad. Nauk SSSR, Novosibirsk (1981).