Semigroups containing ubiquitous elements.
D.W. Miller (1982)
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D.W. Miller (1982)
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F. Catino, F. Migliorini (1992)
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K. Byleen (1979)
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L. Márki, O. Steinfeld (1974)
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G. Mashevitzky (1997)
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D.J. Hansen (1986)
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K.D. jr. Magill (1975)
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E. D. DeVun (1980)
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F.R. McMorris, C.S. jr. Johnson (1974)
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