Kalman's criterion on the uniqueness of continuation for the nilpotent system of wave equations

Li, Tatsien; Rao, Bopeng

Comptes Rendus. Mathématique, Volume 356 (2018) p. 1188-1194

On the approximate boundary synchronization for a coupled system of wave equations: direct and indirect controls

Li, Tatsien; Rao, Bopeng

ESAIM: Control, Optimisation and Calculus of Variations, Volume 24 (2018) p. 1675-1704