Wt. Zhang et al., A SENSIBLE FEEDBACK COEFFICIENT AND AN EXPONENTIAL DECAY DOMAIN OF THE ENERGY, Comptes rendus de l'Academie des sciences. Serie 1, Mathematique, 324(7), 1997, pp. 801-806
Using the multiplier method, we introduce a sensible feedback coeffici
ent and an exponential decay domain of the energy of the wave equation
. Moreover, some earlier results are united and improved.