Free subsemigroups of a free semigroup
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Publication:2395874
DOI10.1307/mmj/1028999307zbMath0134.02302OpenAlexW1977922035MaRDI QIDQ2395874
Publication date: 1965
Published in: Michigan Mathematical Journal (Search for Journal in Brave)
Full work available at URL: https://doi.org/10.1307/mmj/1028999307
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