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Noetherian and finitely presented polygons. (Russian) Zbl 0444.20064
Uch. Zap. Tartu. Gos. Univ. 431, Tr. Mat. Mekh. 20, 37-46 (1977).

MSC:
20M30 Representation of semigroups; actions of semigroups on sets
20M50 Connections of semigroups with homological algebra and category theory
20M05 Free semigroups, generators and relations, word problems