@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://www.numdam.org/item/ASNSP_1987_4_14_2_229_0/}
}