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Dedicated to L. Rédei on his 70th Birthday
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Aczél, J., Baker, J.A., Djoković, D.Ž. et al. Extensions of certain homomorphisms of subsemigroups to homomorphisms of groups. Aequat. Math. 6, 263–271 (1971). https://doi.org/10.1007/BF01819762
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DOI: https://doi.org/10.1007/BF01819762