YANG, GOU-SHENG, and MIN-CHUNG HONG. “A NOTE ON HADAMARD’S INEQUALITY”. Tamkang Journal of Mathematics 28, no. 1 (March 1, 1997): 33–37. Accessed November 21, 2024. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4331.