1. Bhatia R., Matrix Analysis, Grad. Texts in Math., 169, Springer, New York, 1997
2. Bhatia R., Positive Definite Matrices, Princeton Ser. Appl. Math., Princeton University Press, Princeton, 2007
3. Bhatia R., Davis C., More matrix forms of the arithmetic-geometric mean inequality, SIAM J. Matrix Anal. Appl., 1993, 14(1), 132–136
4. Dragomir S.S., Pečarić J., Persson L.E., Properties of some functionals related to Jensen’s inequality, Acta Math. Hungar., 1996, 70(1–2), 129–143
5. Furuta T., Mićić Hot J., Pečarić J., Seo Y., Mond-Pečaric Method in Operator Inequalities, Monographs in Inequalities, 1, Element, Zagreb, 2005