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Translated from Kibernetika, No. 2, pp. 4–11, March–April, 1972.
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Anisimov, A.V. Some algorithmic problems for groups and context-free languages. Cybern Syst Anal 8, 174–182 (1972). https://doi.org/10.1007/BF01068483
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DOI: https://doi.org/10.1007/BF01068483