Optimal two parameter bounds for the Seiffert mean
  In this note we obtain sharp bounds for the Seiffert mean in terms of a two parameter family of means. Our results generalize and extend the recent bounds presented in the Journal of Inequalities and Applications (2012) and Abstract and Applied Analysis (2012). 
Yu-Ming Chu, Miao-Kun Wang and Ye-Fang Qiu
math.CA