List of citations in Numdam for : On time optimal control of the wave equation, its regularization and optimality system
ESAIM: Control, Optimisation and Calculus of Variations, Volume 19 (2013) no. 2, pp. 317-336.
ESAIM: Control, Optimisation and Calculus of Variations, Volume 21 (2015) no. 2, pp. 442-464.