1. Indirect Boundary Stabilization of Weakly Coupled Hyperbolic Systems
2. Indirect internal stabilization of weakly coupled evolution equations
3. , , and , Vector Valued Laplace Transforms and Cauchy Problems, Monographs in Mathematics Vol. 96 (Birkhäuser, Basel, 2001).
4. Analytic Perturbation Theory for Matrices and Operators, Operator Theory: Advances and Applications Vol. 15 (Birkhäuser, Basel, 1985).
5. and , Linear Operators. Part II: Spectral Theory (Interscience, New York, 1963).