Differential properties of the operator of best approximation of complex-valued functions. II
English version (Springer): Ukrainian Mathematical Journal 39 (1987), no. 6, pp 586-590.
Citation Example: Kovtunets V. V. Differential properties of the operator of best approximation of complex-valued functions. II // Ukr. Mat. Zh. - 1987. - 39, № 6. - pp. 721–727.
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