no. 2
Schrödinger equation spectrum and Korteweg-De Vries type invariants
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 24 (1976) no. 2, pp. 161-164 
@article{AIHPA_1976__24_2_161_0,
     author = {Perelomov, A. M.},
     title = {Schr\"odinger equation spectrum and {Korteweg-De} {Vries} type invariants},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {161--164},
     year = {1976},
     publisher = {Gauthier-Villars},
     volume = {24},
     number = {2},
     mrnumber = {413208},
     zbl = {0323.35023},
     language = {en},
     url = {https://www.numdam.org/item/AIHPA_1976__24_2_161_0/}
}
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Perelomov, A. M. Schrödinger equation spectrum and Korteweg-De Vries type invariants. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 24 (1976) no. 2, pp. 161-164. https://www.numdam.org/item/AIHPA_1976__24_2_161_0/

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