Geodesic
Invariant normal forms of formal series
Funkcionalʹnyj analiz i ego priloženiâ, Tome 13 (1979) no. 1, pp. 59-60 
G. R. Belitskii. Invariant normal forms of formal series. Funkcionalʹnyj analiz i ego priloženiâ, Tome 13 (1979) no. 1, pp. 59-60. http://geodesic.mathdoc.fr/item/FAA_1979_13_1_a6/
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     title = {Invariant normal forms of formal series},
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] Arnold V.I., UMN, XXX:5 (1975), 3–65 | DOI | MR

[2] Belitskii G.R., Izv. AN SSSR, seriya matem., 40 (1976), 855–868 | MR

[3] Gustavson F., Astron. J., 71 (1 66), 670–686 | DOI