Minasyan, A.B. “ON FOURIER COEFFICIENTS WITH RESPECT TO THE WALSH DOUBLE SYSTEM”. Proceedings of the YSU A: Physical and Mathematical Sciences 48, no. 1 (233) (April 10, 2014): 22–25. Accessed July 22, 2024. https://journals.ysu.am/index.php/proceedings-phys-math/article/view/vol48_no1_2014_pp022-025.