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Translated from Algebra i Logika, Vol 29, No. 1, pp. 35–46, January–February, 1990.
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Nurakunov, A.M. Quasivarieties of algebras with definable principle congruences. Algebra and Logic 29, 26–34 (1990). https://doi.org/10.1007/BF01980218
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DOI: https://doi.org/10.1007/BF01980218