Comments on the permutation property for semigroups.
J. Justin, G. Pirillo (1989)
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J. Justin, G. Pirillo (1989)
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Y. Zalcstein, M. Garzón (1986-1987)
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M.S. Putcha, A. Yaqub (1971)
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P.M. Higgins (1984)
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I.L. Hmelnitsky (1985)
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E.G. Tretjakova (1993)
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I.L. Mel'nichuk (1989)
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R.R. Zapatrin (1993)
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T. Tamura (1971)
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T. Budak (1993)
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V.P. Schneider (1982)
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