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Allatum est die 1 Decembris 1970
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Borkowski, L. Some theorems on the smallest sets closed under the classes of relations and their generalizations. I. Stud Logica 29, 43–72 (1971). https://doi.org/10.1007/BF02121860
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DOI: https://doi.org/10.1007/BF02121860