no. 2
On Signorini's problem and variational problems with thin obstacles
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 4 (1977) no. 2, pp. 343-362 
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     author = {Frehse, Jens},
     title = {On {Signorini's} problem and variational problems with thin obstacles},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {343--362},
     year = {1977},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 4},
     number = {2},
     mrnumber = {509085},
     zbl = {0353.49020},
     language = {en},
     url = {https://www.numdam.org/item/ASNSP_1977_4_4_2_343_0/}
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Frehse, Jens. On Signorini's problem and variational problems with thin obstacles. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 4 (1977) no. 2, pp. 343-362. https://www.numdam.org/item/ASNSP_1977_4_4_2_343_0/

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