Wang, Miao-Kun, et al. “Sharp Bounds for Seiffert Means in Terms of Lehmer Means”. Journal of Mathematical Inequalities, no. 4, 2010, pp. 581-6, https://doi.org/10.7153/jmi-04-51.
Wang, M.-K., Qiu, Y.-F., & Chu, Y. (2010). Sharp bounds for Seiffert means in terms of Lehmer means. Journal of Mathematical Inequalities, 4, 581-586. https://doi.org/10.7153/jmi-04-51
Wang MK, Qiu YF, Chu Y. Sharp bounds for Seiffert means in terms of Lehmer means. Journal of Mathematical Inequalities. 2010;(4):581-6.