@article{CMUC_1995__36_3_a8,
     author = {Chen, Guowang and Wang, Shubin},
     title = {Existence and non-existence of global solutions for nonlinear hyperbolic equations  of higher order},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {475--487},
     publisher = {mathdoc},
     volume = {36},
     number = {3},
     year = {1995},
     mrnumber = {1364488},
     zbl = {0839.35085},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1995__36_3_a8/}
}