ZHANG, S.-L.; CHEN, C.-P.; QI, F. Another proof of monotonicity for extended mean values. Tamkang Journal of Mathematics, [S. l.], v. 37, n. 3, p. 207–209, 2006. DOI: 10.5556/j.tkjm.37.2006.165. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/165. Acesso em: 19 aug. 2022.