2 citations to https://www.mathnet.ru/rus/sm2461
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Davydov O., “Asymptotic-Behavior of the Best Approximations of Individual Functions of Classes W-Tau-H-Omega in Metric Lp”, 306, no. 4, 1989, 777–781
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Н. П. Корнейчук, “С. М. Никольский и развитие исследований по теории приближения
функций в СССР”, УМН, 40:5(245) (1985), 71–131 ; N. P. Korneichuk, “S. M. Nikol'skii and the development of research on approximation theory in the USSR”, Russian Math. Surveys, 40:5 (1985), 83–156