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Translated from Algebra i Logika, Vol. 30, No. 2, pp. 125–153, March–April, 1991.
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Budkin, A.I. Independent axiomatizability of quasi-varieties of soluble groups. Algebra and Logic 30, 81–100 (1991). https://doi.org/10.1007/BF01978829
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DOI: https://doi.org/10.1007/BF01978829