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Additional information
Dnepropetrovsk. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 32, No. 5, pp. 12–28, September–October, 1991.
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Ganzburg, M.I. On best approximation of infinitely differentiable functions. Sib Math J 32, 733–749 (1991). https://doi.org/10.1007/BF00971172
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DOI: https://doi.org/10.1007/BF00971172