Semigroups of rank 1 (in Russian).
V.V. Demencuk (1974)
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V.V. Demencuk (1974)
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J.M. Howie, E. Giraldes (1984)
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S.D. Hippisley-Cox (1994)
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L. Satko, O. Grosek (1980)
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A. Mukherjea (1986)
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S. Gaubert (1997)
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H. Umoh (1992)
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D.W. Miller (1982)
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S. Gaubert (1996)
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A. Varisco, A. Cherubini (1986-1987)
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H.J. Weinert (1978)
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