@article{ASENS_2000_4_33_4_485_0,
     author = {Smith, Hart F. and Sogge, Christopher D.},
     title = {Null form estimates for $(1/2,1/2)$ symbols and local existence for a quasilinear {Dirichlet-wave} equation},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {485--506},
     publisher = {Elsevier},
     volume = {Ser. 4, 33},
     number = {4},
     year = {2000},
     doi = {10.1016/s0012-9593(00)00119-1},
     mrnumber = {2002j:35194},
     zbl = {01702165},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/s0012-9593(00)00119-1/}
}