@article{MZ_1965__90_170478,
     author = {Rolf Leis},
     title = {Zur {Dirichletschen} {Randwertaufgabe} des {Au{\ss}enraumes} der {Schwingungsgleichung.}},
     journal = {Mathematische Zeitschrift},
     pages = {205--211},
     publisher = {mathdoc},
     volume = {90},
     year = {1965},
     zbl = {0132.33602},
     url = {http://geodesic.mathdoc.fr/item/MZ_1965__90_170478/}
}