Rate of approximation by rectangular partial sums of double orthogonal series Author: V. A. Andrienko
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Lacunary (0; 0, 1) interpolation on the roots of Jacobi polynomials and their derivatives, respectively. I (Existence, explicit formulae, unicity) Authors: I. Joó and L. G. Pál
On the interrelation of the generalized Besov-Nikol'skii and Weyl-Nikol'skii classes of functions Authors: M. K. Potapov and B. V. Simonov