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The authors wish to acknowledge support by the National Science Foundation, Grant GP-5875.
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Hill, P., Megibben, C. Extending automorphisms and lifting decompositions in Abelian groups. Math. Ann. 175, 159–168 (1968). https://doi.org/10.1007/BF01418771
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DOI: https://doi.org/10.1007/BF01418771