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KUNC, Michal. Algebraic characterization of the finite power property. In Automata, Languages and Programming: 33rd International Colloquium, ICALP 2006, Venice, Italy, July 10-14, 2006, Proceedings, Part I. Berlin: Springer, 2006, s. 120-131. ISBN 3-540-35904-4.Podrobněji: https://is.muni.cz/publication/639524/cs