Orthodox semigroups.
P.S. Venkatesan (1980)
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P.S. Venkatesan (1980)
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M.B. Szendrei (1980)
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C.C. Edwards (1980)
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M.B. Szendrei (1982)
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Gracinda M.S. Gomes (1988)
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H.L. Chow (1975)
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M. Yamada (1974)
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W. Williams, Carl Eberhart (1984)
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S. Madhavan (1978)
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J.E. Mills (1985)
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M. Szendrei (1976/77)
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