Chen, Chao-Ping, and Feng Qi. “Extension of an Inequality of H. Alzer for Negative Powers”. Tamkang Journal of Mathematics 36, no. 1 (March 31, 2005): 69-72. Accessed May 23, 2022. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/137.