@article{ASNSP_1998_4_27_2_253_0,
     author = {Lederman, Claudia and Wolanski, Noemi},
     title = {Viscosity solutions and regularity of the free boundary for the limit of an elliptic two phase singular perturbation problem},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {253--288},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 27},
     number = {2},
     year = {1998},
     mrnumber = {1664689},
     zbl = {0931.35200},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1998_4_27_2_253_0/}
}