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@article{JRAM_1986__368_152837, author = {H.W. Alt and D. Phillips}, title = {A free boundary problem for semilinear elliptic equations.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {63--107}, publisher = {mathdoc}, volume = {368}, year = {1986}, zbl = {0598.35132}, url = {http://geodesic.mathdoc.fr/item/JRAM_1986__368_152837/} }
H.W. Alt; D. Phillips. A free boundary problem for semilinear elliptic equations.. Journal für die reine und angewandte Mathematik, Tome 368 (1986), pp. 63-107. http://geodesic.mathdoc.fr/item/JRAM_1986__368_152837/