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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 12, No. 1, pp. 158–170, January–February, 1971.
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Nikol'skii, Y.S. Continuation of weight spaces of differentiable functions. Sib Math J 12, 113–122 (1971). https://doi.org/10.1007/BF00969147
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DOI: https://doi.org/10.1007/BF00969147