MathSciNet bibliographic data MR2045425 37E05 (37A05 37C15) Ruette, Sylvie $C^n$$C^n$ interval maps not Borel conjugate to any $C^\infty$$C^\infty$ map. Proc. Amer. Math. Soc. 132 (2004), no. 4, 1091–1093. Article

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