ZadereiP. V., and Smal’ B. A. “On the Convergence of Fourier Series in the Space $L_1$”. Ukrains’kyi Matematychnyi Zhurnal 54, no. 5 (May 25, 2002): 639-646. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4102.