@article{NUMA_1992__62_1_133643,
     author = {Agn\`es Tourin},
     title = {A comparison theorem for a piecewise {Lipschitz} continuous {Hamiltonian} and application to {Shape-from-Shading} problems.},
     journal = {Numerische Mathematik},
     pages = {75--86},
     publisher = {mathdoc},
     volume = {62},
     number = {1},
     year = {1992},
     zbl = {0762.65087},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1992__62_1_133643/}
}