Remark on stabilization of second order evolution equations by unbounded   dynamic feedbacks and applications
  In this paper we consider second order evolution equations with unbounded dynamic feedbacks. Under a regularity assumption we show that observability properties for the undamped problem imply decay estimates for the damped problem. We consider both uniform and non uniform decay properties. 
Zainab Abbas (LAMAV), Kais Ammari (FSM), Denis Mercier (LAMAV)
math.AP