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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 7, No. 3, pp. 664–684, May–June, 1966.
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Shevrin, L.N. Elementary structural properties of semi-groups. Sib Math J 7, 535–549 (1966). https://doi.org/10.1007/BF00966250
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DOI: https://doi.org/10.1007/BF00966250