@article{AIHPC_2004__21_4_517_0,
     author = {Jalade, Emmanuel},
     title = {Inverse problem for a nonlinear {Helmholtz} equation},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {517--531},
     publisher = {Elsevier},
     volume = {21},
     number = {4},
     year = {2004},
     doi = {10.1016/j.anihpc.2003.07.001},
     mrnumber = {2069636},
     zbl = {1062.35173},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.anihpc.2003.07.001/}
}