@article{ZNSL_1977_69_a4,
     author = {A. V. Ivanov},
     title = {A priori estimates of the second derivatives of solutions to nonlinear second-order equations on the boundary of the domain},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {65--76},
     publisher = {mathdoc},
     volume = {69},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1977_69_a4/}
}