Chu, Yu-Ming, Miao-Kun Wang, and Bao-Yu Liu. “Sharp Inequalities for the Neuman-Sandor Mean in Terms of Arithmetic and Contra-Harmonic Means”.
Rev. Anal. Numér. Théor. Approx. 42, no. 2 (August 1, 2013): 115–120. Accessed April 14, 2025.
https://ictp.acad.ro/jnaat/journal/article/view/2013-vol42-no2-art4.