no. 2
Hölder continuity and thin obstacle problems for vector valued functions
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 13 (1986) no. 2, pp. 281-297. 
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     author = {Karlsson, Thomas},
     title = {H\"older continuity and thin obstacle problems for vector valued functions},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
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Karlsson, Thomas. Hölder continuity and thin obstacle problems for vector valued functions. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 13 (1986) no. 2, pp. 281-297. http://www.numdam.org/item/ASNSP_1986_4_13_2_281_0/

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