TY - JOUR AU - MaciĆ , Fabricio AU - Zuazua Iriondo, Enrique PY - 2002 SN - 0921-7134 UR - https://hdl.handle.net/20.500.14352/57056 T2 - Asymptotic Analysis AB - This paper is devoted to study the property of bservability for wave equations guaranteeing that the total energy of solutions may be estimated by means of the energy concentrated on a subset of the domain or of the boundary. We prove that this... LA - eng M2 - 1 PB - IOS Press KW - Exact Controllability KW - Stabilization KW - Boundary TI - On the lack of observability for wave equations: a Gaussian beam approach TY - journal article VL - 32 ER -