Regular WE-2 semigroups.
A. Nagy (1986-1987)
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A. Nagy (1986-1987)
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M. Zhang, Y. He (1997)
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K.S.S. Nambooripad (1974)
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Janusz Woś (1982)
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S. Lajos (1970)
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S. Lajos (1972)
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D. N. Krgović (1973)
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D. N. Krgović (1976)
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N.R. Reilly (1994)
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