YANG, G.-S.; HWANG, D.-Y. Some refinements of Hardy’s and Copson’s inequality for convex function. Tamkang Journal of Mathematics, [S. l.], v. 32, n. 1, p. 33–37, 2001. DOI: 10.5556/j.tkjm.32.2001.365. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/365. Acesso em: 25 apr. 2024.