LAL, S.; NIGAM, H. K. Degree of approximation by $ (N, p, q) $ summability means of the Fourier-Laguerre expansion. Tamkang Journal of Mathematics, [S. l.], v. 32, n. 2, p. 143–150, 2001. DOI: 10.5556/j.tkjm.32.2001.357. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/357. Acesso em: 19 apr. 2024.