Pogodicheva N. A.
Ukr. Mat. Zh. - 1964. - 16, № 2. - pp. 164-184
For the class of all continuous $2jt$-periodic functions, two processes are considered for the approximation of the functions of this class by trigonometric polynomials.
On Lebegue functions for certain linear methods of approximation on a finite interval by ordinary polynomials
Ukr. Mat. Zh. - 1963. - 15, № 1. - pp. 100-101