MUKHERJEE, Sanjay; J KHAN, A. Approximation Theory on Summability of Fourier Series. American Scientific Research Journal for Engineering, Technology, and Sciences, Jordan, v. 54, n. 1, p. 131–136, 2019. Disponível em: https://www.asrjetsjournal.org/American_Scientific_Journal/article/view/4764. Acesso em: 14 sep. 2025.