no. 1
A free boundary problem for quasi-linear elliptic equations
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 11 (1984) no. 1, pp. 1-44. 
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     title = {A free boundary problem for quasi-linear elliptic equations},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {1--44},
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     volume = {Ser. 4, 11},
     number = {1},
     year = {1984},
     zbl = {0554.35129},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1984_4_11_1_1_0/}
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Alt, Hans Wilhelm; Caffarelli, Luis A.; Friedman, Avner. A free boundary problem for quasi-linear elliptic equations. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 11 (1984) no. 1, pp. 1-44. http://archive.numdam.org/item/ASNSP_1984_4_11_1_1_0/

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