@article{M2AN_1987__21_4_557_0,
     author = {Barles, G. and Perthame, B.},
     title = {Discontinuous solutions of deterministic optimal stopping time problems},
     journal = {ESAIM: Mathematical Modelling and Numerical Analysis },
     pages = {557--579},
     publisher = {AFCET - Gauthier-Villars},
     address = {Paris},
     volume = {21},
     number = {4},
     year = {1987},
     mrnumber = {921827},
     zbl = {0629.49017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/M2AN_1987__21_4_557_0/}
}