Haller-Dintelmann, R. ; Meinlschmidt, H. ; Wollner, W. (2019)
Higher regularity for solutions to elliptic systems in divergence form subject to mixed boundary conditions.
In: Annali di Matematica Pura ed Applicata, 198 (4)
doi: 10.1007/s10231-018-0818-9
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