Article
MSC:
06C05,
06D05,
08A30,
08B15,
20M07 | MR 1182205 | Zbl 0784.20031 | DOI: 10.21136/CMJ.1992.128374
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References:
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[10] Petrich, M.: Lectures in semigroups. Akademie-Verlag, Berlin, 1977. MR 0447437 | Zbl 0369.20036
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