@incollection{AST_1984__118__205_0, author = {Phillips, D.}, title = {The free boundary of a semilinear elliptic equation}, booktitle = {Variational methods for equilibrum problems of fluids - Trento, 20-25 juin 1983}, author = {Collectif}, series = {Ast\'erisque}, publisher = {Soci\'et\'e math\'ematique de France}, number = {118}, year = {1984}, zbl = {0561.35033}, mrnumber = {761750}, language = {en}, url = {http://www.numdam.org/item/AST_1984__118__205_0/} }