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Dedicated toErnst Witt on his 60th birthday
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Banaschewski, B. Functors into categories ofM-sets. Abh.Math.Semin.Univ.Hambg. 38, 49–64 (1972). https://doi.org/10.1007/BF02996922
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DOI: https://doi.org/10.1007/BF02996922