@article{ZNSL_1972_27_a13,
     author = {N. N. Ural'tseva},
     title = {On the regularity of solutions of variational inequalities},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {211--219},
     year = {1972},
     volume = {27},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1972_27_a13/}
}