Geodesic
On the Linearization of Hamiltonian Systems on Poisson Manifolds
Matematičeskie zametki, Tome 78 (2005) no. 3, pp. 323-330

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The linearization of a Hamiltonian system on a Poisson manifold at a given (singular) symplectic leaf gives a dynamical system on the normal bundle of the leaf, which is called the first variation system. We show that the first variation system admits a compatible Hamiltonian structure if there exists a transversal to the leaf which is invariant with respect to the flow of the original system. In the case where the transverse Lie algebra of the symplectic leaf is semisimple, this condition is also necessary. 
@article{MZM_2005_78_3_a0,
     author = {Yu. M. Vorob'ev},
     title = {On the {Linearization} of {Hamiltonian} {Systems} on {Poisson} {Manifolds}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {323--330},
     publisher = {mathdoc},
     volume = {78},
     number = {3},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2005_78_3_a0/}
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Yu. M. Vorob'ev. On the Linearization of Hamiltonian Systems on Poisson Manifolds. Matematičeskie zametki, Tome 78 (2005) no. 3, pp. 323-330. http://geodesic.mathdoc.fr/item/MZM_2005_78_3_a0/