@article{BUMI_2012_9_5_2_a5,
     author = {Salsa, Sandro},
     title = {Viscosity {Solutions} of {Two-Phase} {Free} {Boundary} {Problems} for {Elliptic} and {Parabolic} {Operators}},
     journal = {Bollettino della Unione matematica italiana},
     pages = {263--280},
     publisher = {mathdoc},
     volume = {Ser. 9, 5},
     number = {2},
     year = {2012},
     zbl = {1264.35096},
     mrnumber = {2977249},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BUMI_2012_9_5_2_a5/}
}