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Translated from Algebra i Logika, Vol. 22, No. 1, pp. 53–60, January–February, 1983.
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Medvedev, N.Y. Coverings in the lattice ofl-varieties. Algebra and Logic 22, 39–44 (1983). https://doi.org/10.1007/BF01979648
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DOI: https://doi.org/10.1007/BF01979648