P-regular semigroups.
M. Yamada, M.K. Sen (1989)
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M. Yamada, M.K. Sen (1989)
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M. Zhang, Y. He (1997)
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M. Yamada (1982)
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N. Kehayopulu (1984)
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M.B. Szendrei (1996)
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P.M. Higgins (1995)
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T.E. Nordahl, H.E. Scheiblich (1978)
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K.S.S. Nambooripad (1974)
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K.S.S. Nambooripad, R. Veeramony (1983)
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M. Loganathan, A. Tamilarasi (1995)
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A. Nagy (1986-1987)
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