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Translated from Algebra i Logika, Vol. 27, No. 3, pp. 343–358, May–June, 1988.
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Selivanov, V.L. Index sets of quotient objects of the post numeration. Algebra and Logic 27, 215–224 (1988). https://doi.org/10.1007/BF01978567
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DOI: https://doi.org/10.1007/BF01978567