Semigroups with [ x] [ y] = [y][x].
E. D. DeVun (1980)
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E. D. DeVun (1980)
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A.V. Tishchenko (1994)
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Tatsuhiko Saito (1988)
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J. Fountain, M. Lawson (1985)
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T.E. Hall (1982)
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Y. Tirasupa (1979)
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A. Nagy (1985)
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F. Catino, F. Migliorini (1992)
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R.P. Sullivan (1985)
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V.P. Schneider (1982)
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I.L. Mel'nichuk (1989)
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