YANG, GOU-SHENG, and SHOU-PING JEAN. “INEQUALITIES OF HARDY TYPE IN TWO VARIABLES”. Tamkang Journal of Mathematics 24, no. 3 (September 1, 1993): 341–354. Accessed May 6, 2024. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4507.