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Dedicated to Professor Otto Haupt with best wishes on his 100th birthday.
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Benz, W. The cardinality of the set of discontinuous solutions of a class of functional equations. Aeq. Math. 32, 58–62 (1987). https://doi.org/10.1007/BF02311300
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DOI: https://doi.org/10.1007/BF02311300