no. 1
The regularity of the trace for minimal surfaces
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 3 (1976) no. 1, pp. 139-155 
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     title = {The regularity of the trace for minimal surfaces},
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     pages = {139--155},
     year = {1976},
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Nitsche, Johannes C. C. The regularity of the trace for minimal surfaces. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 3 (1976) no. 1, pp. 139-155. https://www.numdam.org/item/ASNSP_1976_4_3_1_139_0/

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