For citations:

Yusupov G.A. Exact Values of Widths of Some Functional Classes in L2 and Minimization of the Constants in Inequalities of Jackson – Stechkin Type. Modeling and Analysis of Information Systems. 2013;20(5):106-116. (In Russ.) https://doi.org/10.18255/1818-1015-2013-5-106-116