Geodesic
Construction of Separation Variables for Finite-Dimensional Integrable Systems
Teoretičeskaâ i matematičeskaâ fizika, Tome 128 (2001) no. 2, pp. 205-225

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We consider a class of integrable systems such that solutions of the corresponding Hamilton–Jacobi equation depend on $n+m$ arbitrary parameters and are represented as products of flat curves. The first n parameters are identified with the values of the integrals of motion. The remaining parameters enter the definition of the integrals of motion as arbitrary constants (charges) and can be used to find separation variables. We show that on the coadjoint orbits of Lie groups, the Casimir operators not only generate a family of integrals but also allow constructing separation variables. 
@article{TMF_2001_128_2_a4,
     author = {A. V. Tsiganov},
     title = {Construction of {Separation} {Variables} for {Finite-Dimensional} {Integrable} {Systems}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {205--225},
     publisher = {mathdoc},
     volume = {128},
     number = {2},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2001_128_2_a4/}
}
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A. V. Tsiganov. Construction of Separation Variables for Finite-Dimensional Integrable Systems. Teoretičeskaâ i matematičeskaâ fizika, Tome 128 (2001) no. 2, pp. 205-225. http://geodesic.mathdoc.fr/item/TMF_2001_128_2_a4/