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Translated from Kibernetika, No. 2, pp. 16–20, 25, March–April, 1987.
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Klyachko, A.A., Rystsov, I.K. & Spivak, M.A. In extremal combinatorial problem associated with the bound on the length of a synchronizing word in an automaton. Cybern Syst Anal 23, 165–171 (1987). https://doi.org/10.1007/BF01071771
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DOI: https://doi.org/10.1007/BF01071771