@article{MZ_1979__167_172841,
     author = {Philip Brenner},
     title = {On the {Existence} of {Global} {Smooth} {Solutions} of {Certain} {Semi-Linear} {Hyperbolic} {Equations.}},
     journal = {Mathematische Zeitschrift},
     pages = {99--136},
     publisher = {mathdoc},
     volume = {167},
     year = {1979},
     zbl = {0388.35048},
     url = {http://geodesic.mathdoc.fr/item/MZ_1979__167_172841/}
}