CHEN, C.-P.; QI, F. Extension of an Inequality of H. Alzer for Negative Powers. Tamkang Journal of Mathematics, [S. l.], v. 36, n. 1, p. 69-72, 2005. DOI: 10.5556/j.tkjm.36.2005.137. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/137. Acesso em: 23 may. 2022.