@article{EJDE_2004__2004__a126,
     author = {Weiss, Georg S.},
     title = {Boundary monotonicity formulae and applications to free boundary problems {I:} {The} elliptic case},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2004},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2004__2004__a126/}
}