Critical points of solutions of elliptic equations in two variables
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 14 (1987) no. 2, pp. 229-256. 
@article{ASNSP_1987_4_14_2_229_0,
     author = {Alessandrini, Giovanni},
     title = {Critical points of solutions of elliptic equations in two variables},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {229--256},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 14},
     number = {2},
     year = {1987},
     mrnumber = {939628},
     zbl = {0649.35026},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1987_4_14_2_229_0/}
}
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Alessandrini, Giovanni. Critical points of solutions of elliptic equations in two variables. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 14 (1987) no. 2, pp. 229-256. http://archive.numdam.org/item/ASNSP_1987_4_14_2_229_0/

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