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Dedicated to Professor K. Tandori on the occasion of his seventieth birthday
This work was supported by the National Science Foundation, Grant No. 1652.
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Daróczy, Z., Maksa, G. Functional equations on convex sets. Acta Math Hung 68, 187–195 (1995). https://doi.org/10.1007/BF01874674
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DOI: https://doi.org/10.1007/BF01874674