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Translated from Matematicheskie Zametki, Vol. 43, No. 6, pp. 770–785, June, 1988.
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Temlyakov, V.N. Approximation by elements of a finite-dimensional subspace of functions from various sobolev or nikol'skii spaces. Mathematical Notes of the Academy of Sciences of the USSR 43, 444–454 (1988). https://doi.org/10.1007/BF01158514
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DOI: https://doi.org/10.1007/BF01158514