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The author gratefully acknowledges support by the South African Council for Scientific and Industrial Research.
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Hauptfleisch, G.J. Torsion-free abelian groups with isomorphic endomorphism rings. Arch. Math 24, 269–273 (1973). https://doi.org/10.1007/BF01228209
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DOI: https://doi.org/10.1007/BF01228209