Lerman, L. M.; Umanskij, Ya. L. Integrable Hamiltonian systems and Poisson actions. (English. Russian original) Zbl 0727.58016 Sel. Math. Sov. 9, No. 1, 59-67 (1990); translation from Methods of the qualitative theory of differential equations, Gor’kij, 126-139 (1984). MSC: 37J99 70H05 37J35 37K10 PDFBibTeX XMLCite \textit{L. M. Lerman} and \textit{Ya. L. Umanskij}, Sel. Math. Sov. 9, No. 1, 59--67 (1990; Zbl 0727.58016); translation from Methods of the qualitative theory of differential equations, Gor'kij, 126--139 (1984)
Lerman, L. M.; Umanskij, Ya. L. Structure of the Poisson action of \({\mathbb{R}}^ 2\) on a four-dimensional symplectic manifold. II. (English) Zbl 0649.58017 Sel. Math. Sov. 7, No. 1, 39-48 (1988). MSC: 53D50 37J99 PDFBibTeX XMLCite \textit{L. M. Lerman} and \textit{Ya. L. Umanskij}, Sel. Math. Sov. 7, No. 1, 39--48 (1988; Zbl 0649.58017)
Lerman, L. M.; Umanskij, Ya. L. Structure of the Poisson action of \(R^ 2\) on a four-dimensional symplectic manifold. I. (English) Zbl 0635.58009 Sel. Math. Sov. 6, 365-396 (1987). Reviewer: A.P.Stone MSC: 37J99 PDFBibTeX XMLCite \textit{L. M. Lerman} and \textit{Ya. L. Umanskij}, Sel. Math. Sov. 6, 365--396 (1987; Zbl 0635.58009)
Lerman, L. M. Hamiltonian systems with loops of a separatrix of a saddle-center. (English. Russian original) Zbl 0743.58017 Sel. Math. Sov. 10, No. 3, 297-306 (1991); translation from Methods of the qualitative theory of differential equations, Gor’kij, 89-103 (1987). Reviewer: M.Baake (Tübingen) MSC: 37J99 PDFBibTeX XMLCite \textit{L. M. Lerman}, Sel. Math. Sov. 10, No. 3, 297--306 (1987; Zbl 0743.58017); translation from Methods of the qualitative theory of differential equations, Gor'kij, 89--103 (1987)