@article{CMH_1987__62_140099,
     author = {P.-A. Vuillermot},
     title = {Nonexistence of spatially localized free vibrations for a class of nonlinear wave equations.},
     journal = {Commentarii mathematici Helvetici},
     pages = {573--586},
     publisher = {mathdoc},
     volume = {62},
     year = {1987},
     zbl = {0656.35093},
     url = {http://geodesic.mathdoc.fr/item/CMH_1987__62_140099/}
}