TY  - JOUR
AU  - Mehrenberger, Michel
TI  - An Ingham type proof for the boundary observability of a $ N-d$ wave equation
JO  - Comptes Rendus. Mathématique
PY  - 2009
SP  - 63
EP  - 68
VL  - 347
IS  - 1-2
PB  - Elsevier
UR  - http://www.numdam.org/articles/10.1016/j.crma.2008.11.002/
DO  - 10.1016/j.crma.2008.11.002
LA  - en
ID  - CRMATH_2009__347_1-2_63_0
ER  -