Critical points of solutions to the obstacle problem in the plane
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 21 (1994) no. 2, pp. 157-173. 
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     title = {Critical points of solutions to the obstacle problem in the plane},
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     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 21},
     number = {2},
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     mrnumber = {1288362},
     zbl = {0823.35068},
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     url = {http://archive.numdam.org/item/ASNSP_1994_4_21_2_157_0/}
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Sakaguchi, Shigeru. Critical points of solutions to the obstacle problem in the plane. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 21 (1994) no. 2, pp. 157-173. http://archive.numdam.org/item/ASNSP_1994_4_21_2_157_0/

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