1. J. Barwise, Back and forth through infinitary logic, in Studies in Model Theory (M. Morley, ed.), MAA (1973), 5–34.
2. J. Barwise and P. Eklof, Infinitary properties of Abelian torsion groups, Ann. Math. Logic 2 (1970), 25–68.
3. P. Eklof, Infinitary equivalence of abelian groups, Fund. Math. 81 (1974), 305–314.
4. L. Fuchs, Infinite Abelian Groups, Vols.I and II, Academic Press (1970, 1973).
5. L. Fuchs, Indecomposable abelian groups of measurable cardinalities, Symposia Math. XIII (1974), 233–244.