Orthodox semigroups.
P.S. Venkatesan (1980)
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P.S. Venkatesan (1980)
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M. Yamada, M.K. Sen (1989)
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M. Yamada (1974)
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Carl Eberhart (1974)
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T.E. Nordahl, H.E. Scheiblich (1978)
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M.B. Szendrei (1980)
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S. Armstrong (1984)
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S. Satoh, K. Yama, M. Tokizawa (1994)
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M. Yamada (1974)
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M.B. Szendrei (1982)
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M.V. Lawson (1989)
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J.E. Mills (1983)
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