%0 Journal Article %A Philip Brenner %T On the Existence of Global Smooth Solutions of Certain Semi-Linear Hyperbolic Equations. %J Mathematische Zeitschrift %D 1979 %P 99-136 %V 167 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZ_1979__167_172841/ %F MZ_1979__167_172841