no. 2
Viscosity solutions and regularity of the free boundary for the limit of an elliptic two phase singular perturbation problem
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 27 (1998) no. 2, pp. 253-288 
@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},
     year = {1998},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 27},
     number = {2},
     mrnumber = {1664689},
     zbl = {0931.35200},
     language = {en},
     url = {https://www.numdam.org/item/ASNSP_1998_4_27_2_253_0/}
}
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Lederman, Claudia; Wolanski, Noemi. Viscosity solutions and regularity of the free boundary for the limit of an elliptic two phase singular perturbation problem. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 27 (1998) no. 2, pp. 253-288. https://www.numdam.org/item/ASNSP_1998_4_27_2_253_0/

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