[8] H. Brezis, An´alisis funcional Teo ria y aplicaciones. Alianza Editorial, Madrid, 1983.
[9] A. Haraux, Semi-groupes lin´eaires equation d’´evolution lin´eaires p´eriodiques, Pub-
lications du Laboratoire d’Analyse Num´erique, N
o
7811 Universit´e Pierre et Marie
Curie (1978).
[10] R. Ikehata, Energy decay of solutions for the semilinear dissipative wave equations
in an exterior domain, Funkcial. Ekvac. 44 (2001) 487-499.
[11] R. Ikehata, Fast decay of solutions for linear wave equations with dissipation localized
near infinity in an exterior domain, J. Differential Equations, 188 (2003) 390-405.
[12] R. Gulliver, I. Lasiecka, W. Littman, R. Triggiani,The Case for Differential Geometry
in the Control of Single and Coupled PDES: The Structural Acoustic Chamber, IMA
Volumes in Mathematics and its Applications, vol. 137, 73-182 (2004).
[13] S. Kesavan, Topics in functional analysis and applications. Wiley Eastern Limited,
Bangalore, 1989.
[14] J. U. Kim, A unique continuation property of a beam equation with variable coeffi-
cients, in estimation and control of distributed parameter sustems. (Desch,W., Kap-
pel, F., Kunisch, K. eds.), 197-205, Birkh¨auser, Basel, 1991 (Internationel Series of
numerical mathematics, 100 (1991)).
[15] J. L. Lions, Exact Controllability, Stabilization and perturbations for Distributed Sys-
tems. SIAM Rev.30, 1-68, 1988.
[16] J. L. Lions, Quelques M´ethodes de R´esolution des Probl`emes aux Limites Non
Lin´eaires. G authier - Villars, Paris, 1969.
87