Comments on the permutation property for semigroups.
J. Justin, G. Pirillo (1989)
Semigroup forum
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J. Justin, G. Pirillo (1989)
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M.S. Putcha, A. Yaqub (1971)
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B. Piochi (1991)
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A. Nagy (1994)
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M. Gutan (1996)
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Y. Zalcstein, M. Garzón (1986-1987)
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Y. Zalcstein, M. Garzón (1986-1987)
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Dugald Macpherson, Robert Woodrow (1992)
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A.V. Kelarev (1994)
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S.L. Lipscomb (1992)
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