Geodesic
Formal integral of a divergence-free system
Matematičeskie zametki, Tome 57 (1995) no. 6, pp. 803-813 
A. D. Bruno; S. Yu. Sadov. Formal integral of a divergence-free system. Matematičeskie zametki, Tome 57 (1995) no. 6, pp. 803-813. http://geodesic.mathdoc.fr/item/MZM_1995_57_6_a0/
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Voir la notice de l'article provenant de la source Math-Net.Ru

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[3] Broer H., Bifurcation of Singularities in Volume Preserving Vector Fields, Dissertation, Groningen, 1979

[4] Broer H., “Formal normal form theorems for vector fields and consequences for bifurcation in the volume preserving case”, Dynamical Systems and Turbulence, Springer Lecture Notes in Math., 898, eds. D. A. Rand, L. S. Young, 1981, 54–74 | MR | Zbl

[5] Kurosh A. G., Teoriya grupp, 2-e izd., Gostekhizdat, M., 1953