On continuous convex or concave functions with respect to the logarithmic mean
Acta Universitatis Carolinae. Mathematica et Physica, Tome 46 (2005) no. 1, pp. 3-10.

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Classification : 26A51, 26D15, 26E60, 39B72 
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Zgraja, Tomasz. On continuous convex or concave functions with respect to the logarithmic mean. Acta Universitatis Carolinae. Mathematica et Physica, Tome 46 (2005) no. 1, pp. 3-10. https://geodesic-test.mathdoc.fr/item/AUCMP_2005__46_1_a1/