@article{RSMUP_1994__91__1_0,
     author = {Manfrin, Renato},
     title = {A remark on global smooth solutions for quasilinear wave equations},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {1--17},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {91},
     year = {1994},
     mrnumber = {1289626},
     zbl = {0809.35059},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1994__91__1_0/}
}