@article{SM_1995_80_2_a5,
     author = {K. N. Soltanov},
     title = {On nonlinear equations of the~form $F(x,u,Du,\Delta u)=0$},
     journal = {Sbornik. Mathematics},
     pages = {367--392},
     year = {1995},
     volume = {80},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1995_80_2_a5/}
}