Improvement of Jensen-Steffensen's inequality for superquadratic functions. Abramovich, S.; Ivelic, S.; Pecaric, J.E. — 2010 Banach Journal of Mathematical Analysis [electronic only]
More about Hermite-Hadamard inequalities, Cauchy's means, and superquadracity. Abramovich, S.; Farid, G.; Pečarić, J. — 2010 Journal of Inequalities and Applications [electronic only]