@article{ASNSP_1977_4_4_2_373_0,
     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/}
}