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Additional information
Translated from Sibirskii Matematicheskii Zhurnal, Vol. 8, No. 3, pp. 659–668. May–June, 1967.
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Salii, V.N. Semigroups of 2-sets. Soviet Mathematical Journal 8, 488–495 (1967). https://doi.org/10.1007/BF02196430
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DOI: https://doi.org/10.1007/BF02196430