1. Sobolev Spaces, Academic Press, New Yourk, 1975.
2. Lectures on Elliptic Boundary Value Problems, Van Nostrand, Princeton, 1965.
3. Energy methods for quasilinear hyperbolic initial-boundary value problems. Applications to elastodynamics
4. Global existence and asymptotic behavior of smooth solutions in one-dimensional nonlinear thermoelasticity, Bonner Mathematische Schriften 192. Bonn. 1989.
5. and , On some quasilinear hyperbolic-parabolic initial boundary value problems, SFB 256 Preprint, No. 42, University of Bonn, 1988.