...- semigroups.
T. E. Hays (1977)
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T. E. Hays (1977)
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J.E. Ault (1974)
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F. Knowles (1974)
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A Pollatchek (1976)
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M. Friedberg (1975)
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W. Taylor (1976)
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G.R. Baird (1972)
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H. Jürgensen (1977/78)
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