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Translated from Itogi Nauki i Tekhniki (Teoriya Veroyatnostei, Matematicheskaya Statistika, Teoreticheskaya Kibernetika), Vol. 10, pp. 107–142, 1972.
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Gladkii, A.V., Dikovskii, A.Y. Theory of formal grammars. J Math Sci 2, 542–563 (1974). https://doi.org/10.1007/BF01085017
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DOI: https://doi.org/10.1007/BF01085017