Chico conference on semigroups, California State University, Chico, April 10-12, 1986.
S.M. Goberstein (1986-1987)
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S.M. Goberstein (1986-1987)
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M.B. Szendrei, G. Pollák (1996)
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H. Jürgensen (1986)
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J.M. Howie (1992)
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H. Jürgensen (1977/78)
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A Pollatchek (1976)
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F. Knowles (1974)
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T. E. Hays (1977)
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