@article{AIHPC_2012__29_1_83_0,
     author = {Lewis, John L. and Nystr\"om, Kaj},
     title = {Regularity of flat free boundaries in two-phase problems for the {\protect\emph{p}-Laplace} operator},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {83--108},
     publisher = {Elsevier},
     volume = {29},
     number = {1},
     year = {2012},
     doi = {10.1016/j.anihpc.2011.09.002},
     zbl = {1241.35221},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1016/j.anihpc.2011.09.002/}
}