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Zdun, M. On the uniqueness of solutions of the functional equationϕ(x+f(x))=ϕ(x)+ϕ(f(x)) . Aeq. Math. 7, 124 (1971). https://doi.org/10.1007/BF01818716
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DOI: https://doi.org/10.1007/BF01818716