Semigroups containing ubiquitous elements.
D.W. Miller (1982)
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D.W. Miller (1982)
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D.B. McAlister (1980)
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D.P. Yeager (1975)
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A. Foster (1980)
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A. Bobrowski (1997)
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A. Varisco, A. Cherubini (1986-1987)
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L. Márki, J. Fountain, P.N. Anh (1996)
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S. Armstrong (1984)
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B.D. Doytchinov, W.J. Hrusa, S.J. Watson (1997)
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R.J. Warne (1997)
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J.D. Lawson, J.H. Carruth (1970)
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S. Satoh, K. Yama, M. Tokizawa (1994)
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B. Banaschewski (1979)
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