Monotonicity and symmetry of solutions of p-Laplace equations, 1<p<2, via the moving plane method
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 26 (1998) no. 4, pp. 689-707. 
@article{ASNSP_1998_4_26_4_689_0,
     author = {Damascelli, Lucio and Pacella, Filomena},
     title = {Monotonicity and symmetry of solutions of $p${-Laplace} equations, $1 < p < 2$, via the moving plane method},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {689--707},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 26},
     number = {4},
     year = {1998},
     mrnumber = {1648566},
     zbl = {0930.35070},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1998_4_26_4_689_0/}
}
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Damascelli, Lucio; Pacella, Filomena. Monotonicity and symmetry of solutions of $p$-Laplace equations, $1 < p < 2$, via the moving plane method. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 26 (1998) no. 4, pp. 689-707. http://www.numdam.org/item/ASNSP_1998_4_26_4_689_0/

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