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Research partially supported by N.S.F. Grant GP-11804.
Research partially supported by the National Research Council of Canada.
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Gould, M., Platt, C. Versatile monoids and versatile categories. Algebra Univ. 1, 54–62 (1971). https://doi.org/10.1007/BF02944955
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DOI: https://doi.org/10.1007/BF02944955