1. Barbu V. (1984). Optimal Control of Variational Inequalities, Pitman.
2. Filtrage Optimal des Systèmes Lineaires;Bensoussan,1971
3. Applications of Variational inequalities in Stochastic Control;Bensoussan,1982
4. Stochastic Maximum Principle for Distributed Parameter Systems;Bensoussan;J. Franklin Institute,1983
5. Perturbation Methods in Optimal Control;Bensoussan,1988