1. V. Barbu, Th. Precupanu, Convexity and optimization in Banach spaces, Editura Academiei București and Sijthoff-Noordhoff International Publishers, București, 1978.
2. F. Bernstein, G. Doetsch, Zur Theorie der konvexen Funktionen, Math. Ann. 76 (1915), 514-526.
3. Z. Kominek, On additive and convex functionals, Radovi Mat. 3 (1987), 267-279.
4. Z. Kominek, M. Kuczma, On the lower hull of convex function, Aequationes Math. 38 (1989), 192-210.
5. Z. Kominek M. Kuczma, Theorems of Bernstein-Doetsch, Piccard and Mehdi, and semilinear topology, Arch. Math. (Basel) 52 (1989), 595-602.
6. M. Kuczma, An Introduction to the Theory of Functional Equations and Inequalities. Canchy's equation and Jensen's inequality, PWN (Polish Scientific Publishers) i Uniwersytet Śląski, Warszawa-Kraków-Katowice, 1985.
7. N. Kuhn, A note on t-convex functions, International Ser. Numer. Math. 71. Birkhäuser Verlag, Basel-Stuttgart, 1984. General Inequalities 4, 269-276. [Proceedings of the Fourth International Conference on General Inequalities held in the Mathematical Institute at Obervolfach, Black Forest, May 8-14, 1983]. Edited by W. Walter.
8. K. Kuratowski, Topologie, vol. I. Monografie Mat. 20. PWN (Polish Scientific Publishers), Warszawa, 1958.
9. M.R. Mehdi, On convex functions, J. London Math. Soc. 39 (1964), 321-326.
10. A.W. Roberts, D.E. Varberg, Convex functions, Academic Press, New York and London, 1973.
11. F.A. Valentine, Convex sets, McGraw-Hill Book Company, New York-San Francisco-Toronto-London, 1964.
Google Scholar
10.1515/amsil
English