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Translated from Algebra i Logika, Vol. 7, No. 2, pp. 27–41, February 1968.
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Kogalovskii, S.R. On compact classes of algebraic systems. Algebr Logic 7, 86–94 (1968). https://doi.org/10.1007/BF02218629
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DOI: https://doi.org/10.1007/BF02218629