Geodesic
Classification of four-dimensional integrable Hamiltonian systems and Poisson actions of $\mathbb{R}^2$ in extended neighborhoods of simple singular points. I
Sbornik. Mathematics, Tome 77 (1994) no. 2, pp. 511-542 
L. M. Lerman; Ya. L. Umanskii. Classification of four-dimensional integrable Hamiltonian systems and Poisson actions of $\mathbb{R}^2$ in extended neighborhoods of simple singular points. I. Sbornik. Mathematics, Tome 77 (1994) no. 2, pp. 511-542. http://geodesic.mathdoc.fr/item/SM_1994_77_2_a15/
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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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