@article{MZ_1959__71_169807,
     author = {Hans G\"unzler},
     title = {Fastperiodische {L\"osungen} linearer hyperbolischer {Differentialgleichungen.}},
     journal = {Mathematische Zeitschrift},
     pages = {223--250},
     publisher = {mathdoc},
     volume = {71},
     year = {1959},
     zbl = {0086.29901},
     url = {http://geodesic.mathdoc.fr/item/MZ_1959__71_169807/}
}