@article{JCA_2002_9_2_JCA_2002_9_2_a18,
     author = {N. Ra{\"\i}ssi and M. Serhani},
     title = {Nonconvex {Duality} and {Viscosity} {Solutions} of the {Hamilton-Jacobi-Bellman} {Equation} in {Optimal} {Control}},
     journal = {Journal of convex analysis},
     pages = {625--648},
     publisher = {mathdoc},
     volume = {9},
     number = {2},
     year = {2002},
     url = {http://geodesic.mathdoc.fr/item/JCA_2002_9_2_JCA_2002_9_2_a18/}
}