Mukherjee, Sanjay, and A J Khan. “Approximation Theory on Summability of Fourier Series”. American Scientific Research Journal for Engineering, Technology, and Sciences 54, no. 1 (April 9, 2019): 131–136. Accessed September 14, 2025. https://www.asrjetsjournal.org/American_Scientific_Journal/article/view/4764.