Jafarov, S. Z. “Linear Methods for Summing Fourier Series and Approximation in Weighted Lebesgue Spaces With Variable Exponents”. Ukrains’kyi Matematychnyi Zhurnal 66, no. 10 (October 25, 2014): 1348–1356. Accessed April 26, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2226.