@article{DAN_1977_234_2_a0,
     author = {A. V. Bitsadze},
     title = {On the {Dirichlet} and {Neumann} problems for nonlinear elliptic equations of second order},
     journal = {Doklady Akademii Nauk},
     pages = {265--268},
     publisher = {mathdoc},
     volume = {234},
     number = {2},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_234_2_a0/}
}