Categorical semigroups.
R.A.R. Monzo (1974)
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R.A.R. Monzo (1974)
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W. Taylor (1972)
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V.P. Schneider (1976/77)
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J.D. Lawson, B. Madison (1970)
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T.E. Hall, D.W.H. Gillam, N.H. Williams (1975)
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A Pollatchek (1976)
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F. Knowles (1974)
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Ada Varisco (1975)
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