MathSciNet bibliographic data MR447188 (56 #5503) 12A70 (20D10) Perlis, Robert On the equation $\zeta \sb{K}(s)=\zeta \sb{K'}(s)$$\zeta \sb{K}(s)=\zeta \sb{K'}(s)$. J. Number Theory 9 (1977), no. 3, 342–360. Article

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