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Translated fromSibirskii Matematicheskii Zhurnal, Vol. 35, No. 4, pp. 879–892, July–August, 1994.
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Sizyi, S.V. Quasivarieties of graphs. Sib Math J 35, 783–794 (1994). https://doi.org/10.1007/BF02106622
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DOI: https://doi.org/10.1007/BF02106622