Regular * semigroups.
T.E. Nordahl, H.E. Scheiblich (1978)
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T.E. Nordahl, H.E. Scheiblich (1978)
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S. Satoh, K. Yama, M. Tokizawa (1994)
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A. Bobrowski (1997)
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M.B. Szendrei (1996)
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R.J. Warne (1997)
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L. Márki, J. Fountain, P.N. Anh (1996)
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N. Tanaka (1990)
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S. Armstrong (1984)
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K.S.S. Nambooripad (1974)
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A. Batbedat, J.B. Fountain (1981)
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E.M. Mogiljanskaja (1974)
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