Geodesic
Finitely smooth polynomial normal forms of $C^\infty$-diffeomorphisms in the neighborhood of a fixed point
Funkcionalʹnyj analiz i ego priloženiâ, Tome 24 (1990) no. 2, pp. 79-80.

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     title = {Finitely smooth polynomial normal forms of $C^\infty$-diffeomorphisms in the neighborhood of a fixed point},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
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I. U. Bronshtein; A. Ya. Kopanskii. Finitely smooth polynomial normal forms of $C^\infty$-diffeomorphisms in the neighborhood of a fixed point. Funkcionalʹnyj analiz i ego priloženiâ, Tome 24 (1990) no. 2, pp. 79-80. http://geodesic.mathdoc.fr/item/FAA_1990_24_2_a9/

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