LAL, S.; YADAV, P. Matrix summability of the conjugate deries of derived Fourier series. Tamkang Journal of Mathematics, [S. l.], v. 33, n. 1, p. 35-44, 2002. DOI: 10.5556/j.tkjm.33.2002.303. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/303. Acesso em: 24 may. 2022.