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The Forty-sixth International Symposium on Functional Equations, June 22–29, 2008, Opava, Czech Republic. Aequ. math. 77, 303–327 (2009). https://doi.org/10.1007/s00010-009-2959-9
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DOI: https://doi.org/10.1007/s00010-009-2959-9