A characterization of the subgroups of the additive rationals.
Ross A. Beaumont and H. S. Zuckerman
Source: Pacific J. Math. Volume 1, Number 2 (1951), 169-177.
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Primary Subjects: 20.0X
Links and Identifiers
 R. Baer, Abelian groups without elemets of finite order. Duke Math. J. 3 (1937), 68-122.