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Translated from Matematicheskie Zametki, Vol. 48, No. 4, pp. 100–109, October, 1990.
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Yongsheng, S., Chun, L. Best approximation of certain classes of smooth functions on the real axis by splines of a higher order. Mathematical Notes of the Academy of Sciences of the USSR 48, 1038–1044 (1990). https://doi.org/10.1007/BF01139605
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DOI: https://doi.org/10.1007/BF01139605