@article{ZNSL_1967_5_a5,
     author = {O. A. Ladyzhenskaya and N. N. Ural'tseva},
     title = {On some classes of nonuniform elliptic equations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {186--191},
     publisher = {mathdoc},
     volume = {5},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1967_5_a5/}
}