Rate of approximation by rectangular partial sums of double orthogonal series Author: V. A. Andrienko
О ДИФФЕРЕНцИРОВАНИИ ИНтЕгРАлОВ От ФУНкцИ И Иж сИММЕтРИЧНых пРОс тРАНстВ ДИФФЕРЕНцИАльНыМИ Б АжИсАМИ Author: Е. И. БЕРЕжНОИ
On the interrelation of the generalized Besov-Nikol'skii and Weyl-Nikol'skii classes of functions Authors: M. K. Potapov and B. V. Simonov
Nelineinaya approksimatsiya po sisteme Khaara i modifikatsii funktsii Authors: M. G. Grigoryan and S. L. Gogyan
Wavelet approximation and Fourier widths of classes of periodic functions of several variables. II Author: Д. Бaзaрхaноь