no. 1
Gradient bounds and Liouville theorems for quasilinear elliptic equations
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 5 (1978) no. 1, pp. 65-104. 
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     author = {Peletier, L. A. and Serrin, J.},
     title = {Gradient bounds and {Liouville} theorems for quasilinear elliptic equations},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {65--104},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 5},
     number = {1},
     year = {1978},
     mrnumber = {481493},
     zbl = {0383.35025},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1978_4_5_1_65_0/}
}
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Peletier, L. A.; Serrin, J. Gradient bounds and Liouville theorems for quasilinear elliptic equations. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 5 (1978) no. 1, pp. 65-104. http://www.numdam.org/item/ASNSP_1978_4_5_1_65_0/

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