@article{JEMS_2014_16_3_a3,
     author = {Andrea Cianchi and Vladimir G. Maz'ya},
     title = {Gradient regularity via rearrangements for $p${-Laplacian} type elliptic boundary value problems},
     journal = {Journal of the European Mathematical Society},
     pages = {571--595},
     publisher = {mathdoc},
     volume = {16},
     number = {3},
     year = {2014},
     doi = {10.4171/jems/440},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/440/}
}