Semigroups containing ubiquitous elements.
D.W. Miller (1982)
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D.W. Miller (1982)
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A. Foster (1980)
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B.D. Doytchinov, W.J. Hrusa, S.J. Watson (1997)
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H.L. Vasudeva, J.S. Pym (1984)
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A. Bobrowski (1997)
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V.P. Schneider (1976/77)
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K. Byleen (1979)
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L. Márki, J. Fountain, P.N. Anh (1996)
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B. Banaschewski (1979)
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G. Mashevitzky (1997)
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T.E. Hall, D.W.H. Gillam, N.H. Williams (1975)
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