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Translated from Matematicheskie Zametki, Vol. 27, No. 5, pp. 683–689, May, 1980.
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Babenko, V.F., Pichugov, S.A. Best linear approximation of some classes of differentiable periodic functions. Mathematical Notes of the Academy of Sciences of the USSR 27, 325–329 (1980). https://doi.org/10.1007/BF01139842
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DOI: https://doi.org/10.1007/BF01139842