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Translated from Matematicheskie Zametki, Vol. 35, No. 5, pp. 677–684, May, 1984.
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Gurchenkov, S.A. Coverings in the lattice ofι-varieties. Mathematical Notes of the Academy of Sciences of the USSR 35, 356–360 (1984). https://doi.org/10.1007/BF01137691
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DOI: https://doi.org/10.1007/BF01137691