Patseika, Pavel G., and Yauheni A. Rouba. “On Rational Abel – Poisson Means on a Segment and Approximations of Markov Functions”. Journal of the Belarusian State University. Mathematics and Informatics, no. 3, Nov. 2021, pp. 6-24, https://doi.org/10.33581/2520-6508-2021-3-6-24.