@article{AIHPC_2006__23_6_781_0,
     author = {S\'anchez, \'Oscar and Soler, Juan},
     title = {Orbital stability for polytropic galaxies},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {781--802},
     publisher = {Elsevier},
     volume = {23},
     number = {6},
     year = {2006},
     doi = {10.1016/j.anihpc.2006.02.001},
     mrnumber = {2271693},
     zbl = {1110.35011},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1016/j.anihpc.2006.02.001/}
}