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Research supported by the Hungarian National Foundation for Scientific Research (OTKA), Grant No. T-016846 and by the Hungarian High Educational Research and Development Found (FKFP), Grant No. 0310/1997.
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Gilányi, A. On Hyers-Ulam Stability of Monomial Functional Equations. Abh.Math.Semin.Univ.Hambg. 68, 321–328 (1998). https://doi.org/10.1007/BF02942569
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DOI: https://doi.org/10.1007/BF02942569