@article{AA_1996_8_2_a11,
     author = {N. N. Ural'tseva},
     title = {$C^1$ regularity of the boundary of a noncoincident set in a problem with an obstacle},
     journal = {Algebra i analiz},
     pages = {205--221},
     publisher = {mathdoc},
     volume = {8},
     number = {2},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_1996_8_2_a11/}
}