Geodesic
Classification of four-dimensional integrable Hamiltonian systems and Poisson actions of
Sbornik. Mathematics, Tome 78 (1994) no. 2, pp. 479-506 
L. M. Lerman; Ya. L. Umanskii. Classification of four-dimensional integrable Hamiltonian systems and Poisson actions of. Sbornik. Mathematics, Tome 78 (1994) no. 2, pp. 479-506. http://geodesic.mathdoc.fr/item/SM_1994_78_2_a12/
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Voir la notice de l'article provenant de la source Math-Net.Ru

Integrable Hamiltonian systems and Poisson actions of the group $\mathbb{R}^2$ with simple singular points on a smooth ($C^\infty$ or real-analytic) four-dimensional symplectic manifold $(M,\Omega)$ are studied, where $\Omega$ is a symplectic 2-form.

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