Perfect monoids.
J.R. Isbell (1971)
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J.R. Isbell (1971)
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M. Kilp (1996)
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Z. Liu (1994)
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U. Knauer (1971)
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Z. Hedrlin, P. Goralcik, M. Münzova (1970)
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U. Knauer (1976/77)
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Z. Liu (1995)
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