@article{JEMS_2007_9_2_a4,
     author = {Francesca Da Lio and Boyan Sirakov},
     title = {Symmetry results for viscosity solutions of fully nonlinear uniformly elliptic equations},
     journal = {Journal of the European Mathematical Society},
     pages = {317--330},
     publisher = {mathdoc},
     volume = {9},
     number = {2},
     year = {2007},
     doi = {10.4171/jems/81},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/81/}
}