SULAIMAN, W. T. “MULTIPLIERS FOR THE $\varphi - |C, \alpha|_k$ SUMMABILITY OF INFINITE SERIES”. Tamkang Journal of Mathematics 24, no. 2 (June 1, 1993): 195–201. Accessed December 21, 2024. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4489.