HWANG, DAH-YAN. “GENERALIZATIONS OF COPSON’S INEQUALITITS INVOLVING SERIES OF POSITIVE TERMS”. Tamkang Journal of Mathematics 29, no. 1 (March 1, 1998): 29–39. Accessed July 3, 2024. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4296.