@article{BSMF_2003__131_2_289_0,
     author = {Carles, R\'emi and Lannes, David},
     title = {Focusing of a pulse with arbitrary phase shift for a nonlinear wave equation},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {289--306},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {131},
     number = {2},
     year = {2003},
     doi = {10.24033/bsmf.2444},
     mrnumber = {1988951},
     zbl = {1026.35081},
     language = {en},
     url = {http://www.numdam.org/articles/10.24033/bsmf.2444/}
}