MathSciNet bibliographic data MR254871 57.50 Guckenheimer, John Axiom ${\rm A}+{\rm no cycles}\Rightarrow \zeta \sb{f}\,(t)$${\rm A}+{\rm no cycles}\Rightarrow \zeta \sb{f}\,(t)$ rational. Bull. Amer. Math. Soc. 76 1970 592–594. Article

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