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Additional information
Novosibirsk. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 27, No. 6, pp. 210–215, November–December, 1986.
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Chernikov, P.V. Metric spaces and extensions of mappings. Sib Math J 27, 958–962 (1986). https://doi.org/10.1007/BF00970017
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DOI: https://doi.org/10.1007/BF00970017