BitsadzeK. R. “On the Sets of Divergence of Multiple Fourier–Haar Series”. Ukrains’kyi Matematychnyi Zhurnal 74, no. 12 (January 17, 2023): 1625 - 1639. Accessed July 27, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/6886.