Qi, Feng. “The Extended Mean Values: Definition, Properties, Monotonicities, Comparison, Convexities, Generalizations, and Applications”. CUBO, A Mathematical Journal 5, no. 3 (October 1, 2003): 63–90. Accessed March 18, 2026. https://cubo.ufro.cl/index.php/cubo/article/view/1666.