R. A. Lasuriya, “(ϕ, α)-Strong Summability of Fourier–Laplace Series for Functions Continuous on a Sphere”, Ukr. Mat. Zhurn., vol. 54, no. 5, pp. 656–665, May 2002, Accessed: Dec. 06, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/4104