Karagulyan, G.A., and K.R. Muradyan. “ON THE DIVERGENCE OF WALSH AND HAAR SERIES BY SECTORIAL AND TRIANGULAR REGIONS”. Proceedings of the YSU A: Physical and Mathematical Sciences 48, no. 2 (234) (July 10, 2014): 3–12. Accessed November 22, 2024. https://pub.ysu.am/index.php/proceedings-phys-math/article/view/vol48_no2_2014_pp003-012.