Geodesic
The topology of isoenergy surfaces for the Sokolov integrable case on the Lie algebra $\operatorname{so}(3,1)$
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 4 (2011), pp. 62-65

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Sokolov's integrable case on $\operatorname{so}(3,1)$ is studied. This is a Hamiltonian system with two degrees of freedom where both the hamiltonian and additional integral are homogeneous polynomials of degrees $2$ and $4$, respectively. The topology of isoenergy surfaces is described for different values of parameters. 
@article{VMUMM_2011_4_a13,
     author = {D. V. Novikov},
     title = {The topology of isoenergy surfaces for the {Sokolov} integrable case on the {Lie} algebra $\operatorname{so}(3,1)$},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {62--65},
     publisher = {mathdoc},
     number = {4},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2011_4_a13/}
}
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D. V. Novikov. The topology of isoenergy surfaces for the Sokolov integrable case on the Lie algebra $\operatorname{so}(3,1)$. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 4 (2011), pp. 62-65. http://geodesic.mathdoc.fr/item/VMUMM_2011_4_a13/