Bloom, Stephen L.; Ésik, Zoltan; Kuich, Werner Partial Conway and iteration semirings. (English) Zbl 1167.08002 Fundam. Inform. 86, No. 1-2, 19-40 (2008). Reviewer: Albert A. Mullin (Madison) MSC: 08A70 16Y60 68Q70 03D05 03D75 PDF BibTeX XML Cite \textit{S. L. Bloom} et al., Fundam. Inform. 86, No. 1--2, 19--40 (2008; Zbl 1167.08002) OpenURL
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Karhumäki, Juhani; Latteux, Michel; Petre, Ion Commutation with codes. (English) Zbl 1079.68051 Theor. Comput. Sci. 340, No. 2, 322-333 (2005). MSC: 68Q45 94A45 PDF BibTeX XML Cite \textit{J. Karhumäki} et al., Theor. Comput. Sci. 340, No. 2, 322--333 (2005; Zbl 1079.68051) Full Text: DOI OpenURL
Aceto, Luca; Fokkink, Wan; Ingólfsdóttir, Anna On a question of A. Salomaa The equational theory of regular expressions over a singleton alphabet is not finitely based. (English) Zbl 0915.68117 Theor. Comput. Sci. 209, No. 1-2, 163-178 (1998). MSC: 68Q45 PDF BibTeX XML Cite \textit{L. Aceto} et al., Theor. Comput. Sci. 209, No. 1--2, 163--178 (1998; Zbl 0915.68117) Full Text: DOI OpenURL
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