@article{10_1007_s10492_007_0007_4,
     author = {Eleuteri, Michela},
     title = {Regularity results for a class of obstacle problems},
     journal = {Applications of Mathematics},
     pages = {137--170},
     publisher = {mathdoc},
     volume = {52},
     number = {2},
     year = {2007},
     doi = {10.1007/s10492-007-0007-4},
     mrnumber = {2305870},
     zbl = {1164.49009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10492-007-0007-4/}
}