[1] R. B. Ash: Measure, Integration and Functional Analysis. Academic Press, New York, 1972. MR 0435321 | Zbl 0249.28001

[2] H. Bauer: Konvexität in topologischen Vektorräumen. Universität Нamburg, 1964.

[3] W. W. Bledsoe: An Inequality about Complex Numbers. Amer. Math. Monthly 77 (1970), 180-182. MR 1535790 | Zbl 0187.31701

[4] N. Bourbaki: Topologie générale. 2nd ed., Paris, 1955.

[5] G. Choquet: Lectures on Analysis. W. A. Benjamin, Inc, New York, 1969. Zbl 0181.39603

[6] D. E. Daykin, A. Wilansky: Sets of Complex Numbers. Math. Mag. 47 (1974), 228-229. MR 0352426 | Zbl 0315.30001

[7] R. P. Kaufman, N. W. Rickert: Аn Inequality concerning Measures. Bull. Аmer. Math. Soc. 72(1966), 672-676. MR 0193209

[8] D. S. Mitrinović: Аnalytic Inequalitis. Springer Verlag, New Yoгk, 1970.

[9] W. Rudin: Real and Complex Аnalysis. McGraw-Hill, Inc, New York, 1974. MR 0344043