Lal, Shyam. “On the Degree of Approximation of Conjugate of a Function Belonging to Weighted $ W(L^p,\xi(t))$ Class by Matrix Summability Means of Conjugate Series of a Fourier Series”. Tamkang Journal of Mathematics 31, no. 4 (December 31, 2000): 279-288. Accessed May 24, 2022. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/385.