@article{01184343, title = {Viscosity solutions of elliptic partial differential equations.}, journal = {Documenta Mathematica}, year = {1998}, pages = {31-38}, zbl = {0896.35041}, language = {en}, url = {http://dml.mathdoc.fr/item/01184343} }
Jensen, Robert R. Viscosity solutions of elliptic partial differential equations.. Documenta Mathematica, (1998), pp. 31-38. http://gdmltest.u-ga.fr/item/01184343/