@article{ZNSL_2007_348_a0,
     author = {M. Bildhauer and M. Fuchs},
     title = {Error estimates for obstacle problems {Of} higher order},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {5--18},
     publisher = {mathdoc},
     volume = {348},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2007_348_a0/}
}