@article{CRMATH_2006__343_7_493_0,
     author = {Roland Glowinski and Tuomo Rossi},
     title = {A mixed formulation and exact controllability approach for the computation of the periodic solutions of the scalar wave equation. {(I):} {Controllability} problem formulation and related iterative solution},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {493--498},
     publisher = {Elsevier},
     volume = {343},
     number = {7},
     year = {2006},
     doi = {10.1016/j.crma.2006.08.002},
     language = {en},
}