@article{MZ_1976__149_172396,
     author = {Volker Vogelsang},
     title = {\"Uber nichtlineare {Wellengleichungen} mit zeitabh\"angigem {Hauptteil.}},
     journal = {Mathematische Zeitschrift},
     pages = {249--260},
     publisher = {mathdoc},
     volume = {149},
     year = {1976},
     zbl = {0325.35068},
     url = {http://geodesic.mathdoc.fr/item/MZ_1976__149_172396/}
}