The structure of the critical set in the general mountain pass principle
Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 6, Tome 3 (1994) no. 3, pp. 345-362. 
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     author = {Fang, Guangcai},
     title = {The structure of the critical set in the general mountain pass principle},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {345--362},
     publisher = {Universit\'e Paul Sabatier},
     address = {Toulouse},
     volume = {Ser. 6, 3},
     number = {3},
     year = {1994},
     mrnumber = {1313354},
     zbl = {0834.58014},
     language = {en},
     url = {http://archive.numdam.org/item/AFST_1994_6_3_3_345_0/}
}
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Fang, Guangcai. The structure of the critical set in the general mountain pass principle. Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 6, Tome 3 (1994) no. 3, pp. 345-362. http://archive.numdam.org/item/AFST_1994_6_3_3_345_0/

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