Singularity theory and the geometry of a nonlinear elliptic equation
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 17 (1990) no. 1, pp. 1-33. 
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     title = {Singularity theory and the geometry of a nonlinear elliptic equation},
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Ruf, Bernhard. Singularity theory and the geometry of a nonlinear elliptic equation. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 17 (1990) no. 1, pp. 1-33. http://archive.numdam.org/item/ASNSP_1990_4_17_1_1_0/

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