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This work was supported by the National Science Foundation research grant No. G-19915.
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Beaumont, R.A., Pierce, R.S. Isomorphic direct summands of abelian groups. Math. Ann. 153, 21–37 (1964). https://doi.org/10.1007/BF01361704
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DOI: https://doi.org/10.1007/BF01361704