A Sturm-Liouville theorem for nonlinear elliptic partial differential equations
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 3, Volume 20 (1966) no. 3, p. 543-582 
@article{ASNSP_1966_3_20_3_543_0,
     author = {Berger, Melvyn},
     title = {A Sturm-Liouville theorem for nonlinear elliptic partial differential equations},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 20},
     number = {3},
     year = {1966},
     pages = {543-582},
     zbl = {0147.09503},
     mrnumber = {211299},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1966_3_20_3_543_0}
}

Berger, Melvyn S. A Sturm-Liouville theorem for nonlinear elliptic partial differential equations. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 3, Volume 20 (1966) no. 3, pp. 543-582. http://www.numdam.org/item/ASNSP_1966_3_20_3_543_0/

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