Grigoryan, M. G., and L. S. Simonyan. “On the Convergence of Bochner-Riesz’s Spherical Means of Fourier Double Integrals”. The Journal of the Indian Mathematical Society 88, no. 1-2 (January 28, 2021): 88–96. Accessed September 1, 2024. https://informaticsjournals.com/index.php/jims/article/view/21651.