%0 Journal Article
%A Mehrenberger, Michel
%T An Ingham type proof for the boundary observability of a $ N-d$ wave equation
%J Comptes Rendus. Mathématique
%D 2009
%P 63-68
%V 347
%N 1-2
%I Elsevier
%U http://www.numdam.org/articles/10.1016/j.crma.2008.11.002/
%R 10.1016/j.crma.2008.11.002
%G en
%F CRMATH_2009__347_1-2_63_0