Conjugate Fourier Series of (N,p,q) Summability of Approximation Theory. Global Journal of Science Frontier Research, [S. l.], v. 19, n. F4, p. 29–36, 2019. Disponível em: https://www.journalofscience.org/index.php/GJSFR/article/view/2560. Acesso em: 14 aug. 2026.