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Badora, R. The Thirty-fourth International Symposium on Functional Equations, June 10 to 19, 1996, Wisła-Jawornik, Poland. Aeq. Math. 53, 162–205 (1997). https://doi.org/10.1007/BF02215972
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DOI: https://doi.org/10.1007/BF02215972