%0 Journal Article
%A Weijiu Liu
%A Graham Williams
%T Exact Neumann boundary controllability for second order hyperbolic equations
%J Colloquium Mathematicum
%D 1998
%P 117-142
%V 76
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/cm-76-1-117-142/
%R 10.4064/cm-76-1-117-142
%G en
%F 10_4064_cm_76_1_117_142