@article{AIHPA_1991__54_4_403_0,
     author = {Gon\c{c}alves Ribeiro, J. M.},
     title = {Instability of symmetric stationary states for some nonlinear {Schr\"odinger} equations with an external magnetic field},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {403--433},
     publisher = {Gauthier-Villars},
     volume = {54},
     number = {4},
     year = {1991},
     mrnumber = {1128864},
     zbl = {0741.35080},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1991__54_4_403_0/}
}