@article{ZNSL_1972_30_a18,
     author = {V. A. Solonnikov},
     title = {The differential properties of weak solutions of quasilinear elliptic equations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {174--175},
     year = {1972},
     volume = {30},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1972_30_a18/}
}