@article{MZ_1961__77_169993,
     author = {Konrad J\"orgens},
     title = {Das {Anfangswertproblem} in {Gro{\ss}en} f\"ur eine {Klasse} nichtlinearer {Wellengleichung.}},
     journal = {Mathematische Zeitschrift},
     pages = {295--308},
     publisher = {mathdoc},
     volume = {77},
     year = {1961},
     zbl = {0111.09105},
     url = {http://geodesic.mathdoc.fr/item/MZ_1961__77_169993/}
}