Zhang, Su-Ling, Chao-Ping Chen, and Feng Qi. “Another Proof of Monotonicity for Extended Mean Values”. Tamkang Journal of Mathematics 37, no. 3 (September 30, 2006): 207–209. Accessed April 19, 2024. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/165.