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Research of the first author partially supported by NSF grant MCS76-12014.
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Eklof, P.C., Huber, M. Abelian group extensions and the axiom of constructibility. Commentarii Mathematici Helvetici 54, 440–457 (1979). https://doi.org/10.1007/BF02566286
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DOI: https://doi.org/10.1007/BF02566286