@article{AIHPA_1978__28_4_407_0,
     author = {Perelomov, A. M.},
     title = {Equilibrium configurations and small oscillations of some dynamical systems},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {407--415},
     publisher = {Gauthier-Villars},
     volume = {28},
     number = {4},
     year = {1978},
     mrnumber = {511069},
     zbl = {0427.70024},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1978__28_4_407_0/}
}