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Dedicated to Professor Otto Haupt with best wishes on his 100th birthday.
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Alsina, C., Garcia-Roig, J.L. On a functional equation related to the Ptolemaic inequality. Aeq. Math. 34, 298–303 (1987). https://doi.org/10.1007/BF01830679
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DOI: https://doi.org/10.1007/BF01830679