no. 3
Regularity of free boundaries in two dimensions
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 20 (1993) no. 3, pp. 323-339 
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     author = {Sakai, Makoto},
     title = {Regularity of free boundaries in two dimensions},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {323--339},
     year = {1993},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 20},
     number = {3},
     mrnumber = {1256071},
     zbl = {0851.35022},
     language = {en},
     url = {https://www.numdam.org/item/ASNSP_1993_4_20_3_323_0/}
}
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Sakai, Makoto. Regularity of free boundaries in two dimensions. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 20 (1993) no. 3, pp. 323-339. https://www.numdam.org/item/ASNSP_1993_4_20_3_323_0/

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