Reference
Fuchs, L.,Infinite Abelian Groups (Academic Press, New York 1970).
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This research was supported by NSF grant GP-12318.
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Hill, P. Classes of Abelian groups closed under taking subgroups and direct limits. Algebra Univ. 1, 63–70 (1971). https://doi.org/10.1007/BF02944956
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DOI: https://doi.org/10.1007/BF02944956