MathSciNet bibliographic data MR291460 (45 #551) 30A66 (30A20) Toda, Nobushige On the functional equation $\sum \sp{p}\sb{i=0}\,a\sb{i}f\sb{i}\sp{n\sb{}i}=1$$\sum \sp{p}\sb{i=0}\,a\sb{i}f\sb{i}\sp{n\sb{}i}=1$. Tôhoku Math. J. (2) 23 (1971), 289–299. Article

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