Categorical semigroups.
R.A.R. Monzo (1974)
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R.A.R. Monzo (1974)
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G. Thierrin, G. Thomas (1977)
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Ada Varisco (1975)
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B. Banaschewski (1979)
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T. E. Hays (1977)
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J.E. Ault (1974)
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M. Satyanarayana (1974)
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F. Knowles (1974)
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