Semigroups satisfying xy = yg (x,y)x.
S.K. Stein (1987)
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S.K. Stein (1987)
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W. Ruppert (1977)
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M. Satyanarayana, V. L. Mannepalli (1976)
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V. L. Mannepalli (1976)
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V.L. Mannepalli (1975)
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M. Satyanarayana (1974)
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M. Friedberg (1975)
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T. E. Hays (1977)
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J.E. Ault (1974)
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