The earliest semigroup paper?
J.D. Lawson (1996)
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J.D. Lawson (1996)
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P.M. Higgins (1994)
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S.D. Hippisley-Cox (1992)
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N. Kehayopulu (1980)
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M. Jung (1996)
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M. Satyanarayana, T. O'Brien, M. Rajagopalari (1986)
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K.H. Hofmann (1995)
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T. Papazyan (1991)
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Y. Kobayashi (1980)
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K. Byleen (1981)
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A. de Luca (1985)
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