@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}, zbl = {0649.35026}, mrnumber = {939628}, language = {en}, url = {http://www.numdam.org/item/ASNSP_1987_4_14_2_229_0/} }
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://www.numdam.org/item/ASNSP_1987_4_14_2_229_0/
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