Geodesic
Analytic classification of singularities in the generalized Kowalevski case
Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹûternye nauki, no. 2 (2010), pp. 19-28

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In the problem of motion of the Kowalevski top on two constant fields (the A. G. Reyman–M. A. Semenov-Tian-Shansky case) the type of all critical points of the momentum map is calculated.
Keywords: integrable Hamiltonian system, momentum map, bifurcation diagram, type of non-degenerate singularity. 
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     author = {P. E. Ryabov and M. P. Kharlamov},
     title = {Analytic classification of singularities in the generalized {Kowalevski} case},
     journal = {Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹ\^uternye nauki},
     pages = {19--28},
     publisher = {mathdoc},
     number = {2},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VUU_2010_2_a1/}
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P. E. Ryabov; M. P. Kharlamov. Analytic classification of singularities in the generalized Kowalevski case. Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹûternye nauki, no. 2 (2010), pp. 19-28. http://geodesic.mathdoc.fr/item/VUU_2010_2_a1/