Geodesic
A smooth trajectory classification of integrable Hamiltonian systems with two degrees of freedom
Sbornik. Mathematics, Tome 186 (1995) no. 1, pp. 1-27

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In this paper we construct an invariant of integrable Hamiltonian systems with two degrees of freedom (the so-called st-molecule) enabling such systems to be classified on three-dimensional constant-energy surfaces up to orientation-preserving diffeomorphisms taking trajectories into trajectories. 
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     author = {A. V. Bolsinov},
     title = {A smooth trajectory classification of integrable {Hamiltonian} systems with two degrees of freedom},
     journal = {Sbornik. Mathematics},
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     volume = {186},
     number = {1},
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     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1995_186_1_a0/}
}
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A. V. Bolsinov. A smooth trajectory classification of integrable Hamiltonian systems with two degrees of freedom. Sbornik. Mathematics, Tome 186 (1995) no. 1, pp. 1-27. http://geodesic.mathdoc.fr/item/SM_1995_186_1_a0/