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Translated from Algebra i Logika, Vol. 30, No. 4, pp. 432–456, July–August, 1991.
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Serdyukova, N.A. Generalizations of purity. Algebra and Logic 30, 282–296 (1991). https://doi.org/10.1007/BF01985063
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DOI: https://doi.org/10.1007/BF01985063