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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 25, No. 4, pp. 174–178, July–August, 1984.
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Stepanova, A.A. Categorical quasivarieties of Abelian groupoids and quasigroups. Sib Math J 25, 650–653 (1984). https://doi.org/10.1007/BF00968905
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DOI: https://doi.org/10.1007/BF00968905