1. Boros, Z.: Zs. Páles, $${\mathbb{Q}}$$ Q -subdifferential of Jensen-convex functions. J. Math. Anal. Appl. 321, 99–113 (2006)
2. Daróczy, Z., Páles, Z.: Convexity with given infinite weight sequences. Stochastica 11, 5–12 (1987)
3. Dragomir, S.S., Pearce, C.E.M.: Selected Topics on Hermite–Hadamard Inequalities and Applications. Victoria University, RGMIA Monographs (2002)
4. Giaguinta, M., Modica, G.: Mathematical Analysis. Linear and Metric Structures and Continuity. Springer, New York (2007)
5. Hadamard, J.: Étude sur les properiétés entiéres et en particulier dúne fonction considerée par Riemann. J. Math. Pures Appl. 58, 171–215 (1893)