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Translated from Matematicheskie Zametki, Vol. 1, No. 2, pp. 137–148, February, 1967.
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Stechkin, S.B. Best approximation of linear operators. Mathematical Notes of the Academy of Sciences of the USSR 1, 91–99 (1967). https://doi.org/10.1007/BF01268056
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DOI: https://doi.org/10.1007/BF01268056