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• Acta Universitatis Carolinae. Mathematica et Physica
• Volume 40

Author: Zgraja, T.

• Kominek, Z.; Zgraja, T.: Convex functions with respect to logarithmic mean and ѕandwich theorem. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 40 (1999), issue 2, pp. 75-78