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Translated from Matematicheskie Zametki, Vol. 47, No. 4, pp. 35–40, April, 1990.
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Gurchenkov, S.A. The lattice of varieties of rigid lattice-ordered groups does not have the covering property. Mathematical Notes of the Academy of Sciences of the USSR 47, 334–338 (1990). https://doi.org/10.1007/BF01163813
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DOI: https://doi.org/10.1007/BF01163813