Semigroups containing ubiquitous elements.
D.W. Miller (1982)
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D.W. Miller (1982)
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Takayuki Tamura (1974)
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T. Tamura (1975)
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B.D. Doytchinov, W.J. Hrusa, S.J. Watson (1997)
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B. Banaschewski (1979)
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V. L. Mannepalli (1976)
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V.L. Mannepalli (1975)
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M. Satyanarayana, V. L. Mannepalli (1976)
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T.E. Hall, D.W.H. Gillam, N.H. Williams (1975)
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