@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},
     publisher = {Gauthier-Villars},
     volume = {24},
     number = {2},
     year = {1976},
     mrnumber = {413208},
     zbl = {0323.35023},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1976__24_2_161_0/}
}