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Methods Fluids 57 (2008), no. 9, 1421\u20131434.","DOI":"10.1002\/fld.1796"},{"key":"2024072402181768808_j_cmam-2020-0042_ref_004","doi-asserted-by":"crossref","unstructured":"J.  Bergh and J.  L\u00f6fstr\u00f6m,\nInterpolation Spaces. An Introduction,\nGrundlehren Math. Wiss. 223,\nSpringer, Berlin, 1976.","DOI":"10.1007\/978-3-642-66451-9"},{"key":"2024072402181768808_j_cmam-2020-0042_ref_005","doi-asserted-by":"crossref","unstructured":"D.  Braess,\nFinite Elemente. Theorie, schnelle L\u00f6ser und Anwendungen in der Elastizit\u00e4tstheorie, 5th revised ed.,\nSpringer Spektrum, Berlin, 2013.","DOI":"10.1007\/978-3-642-34797-9"},{"key":"2024072402181768808_j_cmam-2020-0042_ref_006","doi-asserted-by":"crossref","unstructured":"S. C.  Brenner and L. R.  Scott,\nThe Mathematical Theory of Finite Element Methods, 3rd ed.,\nTexts Appl. 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