Patseika, P. G. ., Rouba, Y. A. ., & Smatrytski, . K. A. . (2020). On one rational integral operator of Fourier – Chebyshev type and approximation of Markov functions. Journal of the Belarusian State University. Mathematics and Informatics, 2, 6-27. https://doi.org/10.33581/2520-6508-2020-2-6-27