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Bibliography

[1]

E. F. Beckenbach, Generalized convex functions, Bull. Amer. Math. Soc. vol. 43 (1937) pp. 363-371. MR 1563543

[2]

H. Blumberg, On convex functions, Trans. Amer. Math. Soc. vol. 20 (1919) pp. 40-44. MR 1501114

[3]

W. C. Graustein, Introduction to higher geometry, New York, 1930.

[4]

G. Hamel, Eine Basis aller Zahlen und die unstetigen Lösungen der Funktionalgleichung , Math. Ann. vol. 60 (1905) pp. 459-462. MR 1511317

[5]

G. H. Hardy, J. E. Littlewood, G. Pólya, Inequalities, Cambridge, England, 1934.

[6]

J. L. W. V. Jensen, Sur les fonctions convexes et les inégalités entre les valeurs moyennes, Acta Math. vol. 30 (1906) pp. 175-193. MR 1555027

[7]

F. R. Moulton, A simple non-desarguesian plane geometry, Trans. Amer. Math. Soc. vol. 3 (1902) pp. 192-195. MR 1500595

[8]

W. Sierpiński, Sur les fonctions convexes mesurables, Fund. Math. vol. 1 (1920) pp. 125-129.