@article{ZNSL_1976_59_a2,
     author = {A. V. Ivanov},
     title = {A priori estimates for solutions of nonlinear second-order elliptic equations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {31--59},
     year = {1976},
     volume = {59},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1976_59_a2/}
}