1. Complex Analysis;Ahlfors,1953
2. Linear Operators;Dunford,1963
3. The Weyl calculus of pseudodifferential operators;Hörmander;Comm. Pure Appl. Math.,1979
4. Scattering Theory;Lax,1967
5. Decaying modes for the wave equation in the exterior of an obstacle;Lax;Comm. Pure Appl. Math.,1969