no. 2
Positive solutions of an obstacle problem
Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 6, Tome 4 (1995) no. 2, pp. 339-366. 
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     author = {Jianfu, Yang},
     title = {Positive solutions of an obstacle problem},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {339--366},
     publisher = {Universit\'e Paul Sabatier},
     address = {Toulouse},
     volume = {Ser. 6, 4},
     number = {2},
     year = {1995},
     mrnumber = {1344725},
     zbl = {0866.49017},
     language = {en},
     url = {http://archive.numdam.org/item/AFST_1995_6_4_2_339_0/}
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Jianfu, Yang. Positive solutions of an obstacle problem. Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 6, Tome 4 (1995) no. 2, pp. 339-366. http://archive.numdam.org/item/AFST_1995_6_4_2_339_0/

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