@article{DOCMA_1998__S9__a75,
     author = {Jensen, Robert R.},
     title = {Viscosity solutions of elliptic partial differential equations},
     journal = {Documenta mathematica},
     pages = {31--38},
     publisher = {mathdoc},
     volume = {ICM Berlin 1998, Vol. III},
     year = {1998},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DOCMA_1998__S9__a75/}
}