@article{AIHPC_1999__16_2_189_0,
     author = {Cardaliaguet, P. and Dacorogna, B. and Gangbo, W. and Georgy, N.},
     title = {Geometric restrictions for the existence of viscosity solutions},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {189--220},
     publisher = {Gauthier-Villars},
     volume = {16},
     number = {2},
     year = {1999},
     mrnumber = {1674769},
     zbl = {0927.35021},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_1999__16_2_189_0/}
}