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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 19, No. 5, pp. 1141–1153, September–October, 1978.
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Mikhlin, S.G. Equivalent norms in Sobolev spaces and norms of extension operators. Sib Math J 19, 804–813 (1978). https://doi.org/10.1007/BF00973609
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DOI: https://doi.org/10.1007/BF00973609