RADAS, SONJA, and TOMISLAV SIKIC. “A NOTE ON THE GENERALIZATION OF HUA’S INEQUALITY”. Tamkang Journal of Mathematics 28, no. 4 (December 1, 1997): 321–323. Accessed April 20, 2024. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4310.