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Translated from Algebra i Logika, Vol. 24, No. 5, pp. 551–587, September–October, 1985.
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Palyutin, E.A. Normality of Horn theories with a nonmaximal spectrum. Algebra and Logic 24, 361–388 (1985). https://doi.org/10.1007/BF01978710
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DOI: https://doi.org/10.1007/BF01978710