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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 7, No. 6, pp. 1216–1219, November–December, 1966.
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Ashmanov, S.A., Matsedonskaya, O.N. Proper operations satisfying Mal'tsev's postulate. Sib Math J 7, 963–972 (1966). https://doi.org/10.1007/BF00966393
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DOI: https://doi.org/10.1007/BF00966393