MathSciNet bibliographic data MR611541 (58 #29529) 39A15 Lundberg, A. On the functional equation $f(\lambda (x)+g(y))=\mu (x)+h(x+y)$$f(\lambda (x)+g(y))=\mu (x)+h(x+y)$. Aequationes Math. 16 (1977), no. 1-2, 21–30. Article

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