SULAIMAN WT. ON ABSOLUTE NÖRLUND SUMMABILITY OF FOURIER SERIES AND THE DERIVED FOURIER SERIES. Tamkang J. Math. [Internet]. 1990 Mar. 1 [cited 2024 Apr. 20];21(1):79-87. Available from: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4698