Estimation of the widths of classes of smooth functions in the space
English version (Springer): Ukrainian Mathematical Journal 42 (1990), no. 2, pp 248-249.
Citation Example: Kushpel A. K. Estimation of the widths of classes of smooth functions in the space // Ukr. Mat. Zh. - 1990. - 42, № 2. - pp. 279–280.
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