On Ek-semigroups.
A. Varisco, A. Cherubini (1986-1987)
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A. Varisco, A. Cherubini (1986-1987)
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S. Armstrong (1984)
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S. Satoh, K. Yama, M. Tokizawa (1994)
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L. Márki, J. Fountain, P.N. Anh (1996)
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F. Pastijn (1977)
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M. Yamada, M.K. Sen (1989)
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A. Bobrowski (1997)
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K. Byleen (1979)
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H.J. Weinert, R.D. Griepentrog (1977)
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D.J. Hansen (1986)
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R.J. Warne (1997)
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D.P. Yeager (1975)
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