Patseika, Pavel G., et al. “On the Approximation of Conjugate Functions and Their Derivatives on the Segment by Partial Sums of Fourier – Chebyshev Series”. Journal of the Belarusian State University. Mathematics and Informatics, no. 2, July 2024, pp. 6-18, https://journals.bsu.by/index.php/mathematics/article/view/5231.