@article{AFST_1995_6_4_2_339_0,
     author = {Yang Jianfu},
     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},
     zbl = {0866.49017},
     mrnumber = {1344725},
     language = {en},
     url = {https://afst.centre-mersenne.org/item/AFST_1995_6_4_2_339_0/}
}