Hanel, Clemens
; Hörmann, Günther ; Spreitzer, Christian et al. /
Wave equations and symmetric first-order system in case of low regularity. Pseudo-Differential Operators, Generalized Functions and Asymptotics: Selected papers of the 8th ISAAC congress, Moscow, Russia, August 22-27, 2011. editor / Shahla Molahajloo ; Stevan Pilipovi´c ; Joachim Toft ; M. W. Wong. Basel : Birkhäuser, 2013. pp. 283-296 (Operator Theory: Advances and Applications, Vol. 231).