@article{SM_2017_208_6_a4,
     author = {Yu. V. Egorov},
     title = {Boundary value problems for a~nonlinear elliptic equation},
     journal = {Sbornik. Mathematics},
     pages = {842--862},
     publisher = {mathdoc},
     volume = {208},
     number = {6},
     year = {2017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2017_208_6_a4/}
}