SOME REMARKS ON E-m SEMIGROUPS.
Ada Varisco (1975)
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Ada Varisco (1975)
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W. Taylor (1976)
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W. Desch, W. Schappacher (1986-1987)
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T.E. Hall, D.W.H. Gillam, N.H. Williams (1975)
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M.B. Szendrei, G. Pollák (1996)
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T.C. Brown (1990)
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A Pollatchek (1976)
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F. Knowles (1974)
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