The earliest semigroup paper?
J.D. Lawson (1996)
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J.D. Lawson (1996)
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Y. Kobayashi (1980)
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J.B. Kirn (1974)
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M. Jung (1996)
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John Isbell (1974)
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J. Schmidt (1971)
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J. Pym, D. Strauss, A. El-Mabhouh (1994)
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H.J. Shyr (1976)
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J. A. Goldstein (1977/78)
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A.B. Engel (1972)
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