no. 2
Bound states in completely integrable systems with two types of particles
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 29 (1978) no. 2, pp. 169-177 
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     author = {Olshanetsky, M. A. and Rogov, V.-B. K.},
     title = {Bound states in completely integrable systems with two types of particles},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {169--177},
     year = {1978},
     publisher = {Gauthier-Villars},
     volume = {29},
     number = {2},
     mrnumber = {513688},
     zbl = {0416.58014},
     language = {en},
     url = {https://www.numdam.org/item/AIHPA_1978__29_2_169_0/}
}
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Olshanetsky, M. A.; Rogov, V.-B. K. Bound states in completely integrable systems with two types of particles. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 29 (1978) no. 2, pp. 169-177. https://www.numdam.org/item/AIHPA_1978__29_2_169_0/

[1] F. Calogero, Let. Nuovo Cim., t. 13, 1975, p. 411. | MR

[2] M.A. Olshanetsky, A.M. Perelomov, Let. Nuovo Cim., t. 17, 1976, p. 97.

[3] V.I. Arnold, Mathematical Methods in Classical Mechanics (in Russian), « Nauka » Moscow, 1974. | Zbl

[4] M.A. Olshanetsky, A.M. Perelomov, Let. Nuovo Cim., t. 16, 1976, p. 333.

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