... pagesdoi:10.1155/2010/146945 Research Article An Optimal Double Inequality betweenPower-Type Heron and Seiffert MeansYu-Ming Chu,1Miao-Kun Wang,2and Ye-Fang Qiu21Department of Mathematics, ... W. Xia, and Y. Chu, An optimal inequality for power mean, geometric mean and harmonicmean,” International Journal of Modern Mathematics, vol. 5, no. 2, pp. 149–155, 2010.7 Y M. Chu and W f. ... homogeneous means,” Journal ofInequalities in Pure and Applied Mathematics, vol. 3, no. 5, article 71, 2002.21 P. S. Bullen, D. S. Mitrinovi´c,andP.M.Vasi´c, Means and Their Inequalities,...