LI, W.-R.; CHENG, S. S. Two new discrete Ou-Iang type inequalities. Tamkang Journal of Mathematics, [S. l.], v. 33, n. 2, p. 191–198, 2002. DOI: 10.5556/j.tkjm.33.2002.298. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/298. Acesso em: 27 apr. 2024.