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Electric Engineering Institute, Novosibirsk. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 20, No. 1. pp. 196–198, January–February, 1979.
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Burov, A.N. One isoperimetric property of contraction mappings. Sib Math J 20, 142–144 (1979). https://doi.org/10.1007/BF00976140
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DOI: https://doi.org/10.1007/BF00976140