TY  - INPR
A1  - Paneah, Boris
A1  - Schulze, Bert-Wolfgang
T1  - On the existence of smooth solutions of the dirichlet problem for hyperbolic : differential equations
T3  - Preprint - (1998) 05 
Y1  - 2008
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/2313
UR  - https://nbn-resolving.org/urn:nbn:de:kobv:517-opus-25179
ER  -