@article{ZNSL_1968_11_a3,
     author = {O. A. Ladyzhenskaya and N. N. Ural'tseva},
     title = {On some classes of nonuniformly elliptic equations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {129--149},
     publisher = {mathdoc},
     volume = {11},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1968_11_a3/}
}