A UNIFIED PROOF OF SEVERAL INEQUALITIES AND SOME NEW INEQUALITIES INVOLVING NEUMAN-SÁNDOR MEAN.

In the paper, by finding linear relations of differences between some means, the authors supply a unified proof of several double inequalities for bounding Neuman-Sándor means in terms of the arithmetic, harmonic, and contra-harmonic means and discover some new sharp inequalities involving Neuman-Sándor, contra-harmonic, root-square, and other means of two positive real numbers. [ABSTRACT FROM AUTHOR]