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Additional information
Translated from Sibirskii Matematicheskii Zhurnal, Vol. 15, No. 2, pp. 450–454, March–April, 1974.
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Shneerson, L.M. On free subsemigroups of finitely defined semigroups. Sib Math J 15, 325–328 (1974). https://doi.org/10.1007/BF00968297
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DOI: https://doi.org/10.1007/BF00968297