The Relaxed Stochastic Maximum Principle in Singular Optimal Control of Diffusions. - Seid Bahlali; Boualem Djehiche; Brahim Mezerdi (SIAM J. Control. Optim., 2007)

Necessary and Sufficient Optimality Conditions for Relaxed and Strict Control Problems. - Seid Bahlali (SIAM J. Control. Optim., 2008)