@article{AA_2012_24_3_a0,
     author = {John Andersson},
     title = {Optimal regularity and free boundary regularity for the {Signorini} problem},
     journal = {Algebra i analiz},
     pages = {1--21},
     publisher = {mathdoc},
     volume = {24},
     number = {3},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AA_2012_24_3_a0/}
}