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Additional information
Translated from Sibirskii Matematicheskii Zhurnal, Vol. 11, No. 1, pp. 168–182, January–February, 1970.
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Skornyakov, L.A. Left valuation semigroups. Sib Math J 11, 135–145 (1970). https://doi.org/10.1007/BF00970241
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DOI: https://doi.org/10.1007/BF00970241