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Translated from Algebra i Logika, Vol. 17, No. 1, pp. 56–78, January–February, 1978.
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Mikheev, V.L. A hierarchy of independentω-processions of cosimple isols. Algebra and Logic 17, 40–57 (1978). https://doi.org/10.1007/BF01670122
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DOI: https://doi.org/10.1007/BF01670122