no. 2
Regularity in free boundary problems
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 4 (1977) no. 2, pp. 373-391. 
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     author = {Kinderlehrer, D. and Nirenberg, L.},
     title = {Regularity in free boundary problems},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {373--391},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 4},
     number = {2},
     year = {1977},
     mrnumber = {440187},
     zbl = {0352.35023},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1977_4_4_2_373_0/}
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Kinderlehrer, D.; Nirenberg, L. Regularity in free boundary problems. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 4 (1977) no. 2, pp. 373-391. http://www.numdam.org/item/ASNSP_1977_4_4_2_373_0/

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