no. 4
A free boundary problem for a nonlinear degenerate elliptic system modeling a thermistor
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 19 (1992) no. 4, pp. 615-636. 
@article{ASNSP_1992_4_19_4_615_0,
     author = {Xinfu Chen and Friedman, Avner},
     title = {A free boundary problem for a nonlinear degenerate elliptic system modeling a thermistor},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {615--636},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 19},
     number = {4},
     year = {1992},
     zbl = {0780.35116},
     mrnumber = {1205886},
     language = {en},
     url = {www.numdam.org/item/ASNSP_1992_4_19_4_615_0/}
}
Xinfu Chen; Friedman, Avner. A free boundary problem for a nonlinear degenerate elliptic system modeling a thermistor. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 19 (1992) no. 4, pp. 615-636. http://www.numdam.org/item/ASNSP_1992_4_19_4_615_0/

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