On c-semigroups
Ladislav Skula (1976)
Acta Arithmetica
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Ladislav Skula (1976)
Acta Arithmetica
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Daniel Berend (1987)
Acta Arithmetica
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Ladislav Bican (1978)
Czechoslovak Mathematical Journal
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Alfred Tarski (1949)
Fundamenta Mathematicae
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J. Haight (1988)
Acta Arithmetica
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