@article{SEDP_1987-1988____A1_0,
     author = {Lebeau, G.},
     title = {\'Equation des ondes semi-lin\'eaires {II.} {Contr\^ole} des singularit\'es et caustiques non-lin\'eaires},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:1},
     pages = {1--7},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1987-1988},
     mrnumber = {1018173},
     zbl = {0686.35016},
     language = {fr},
     url = {http://www.numdam.org/item/SEDP_1987-1988____A1_0/}
}