1. em>Controllability for the parabolic equations
2. J. P. Kernevez, The Sentinel Method and Its Applications to Environmental Pollution Problems, Boca
3. J. L. Lions, Sentinelle pour les systèmes distribués à données incomplètes.
4. R. Temam, Navier-Stokes
5. em>Estimation of pollution term in Petrowsky system with incomplete data