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Control Optim. 37 (1999), no. 4, 1176\u20131194.","DOI":"10.1137\/S0363012997328609"},{"key":"2023070413382941006_j_cmam-2022-0148_ref_008","doi-asserted-by":"crossref","unstructured":"M. Bergounioux and K. Kunisch,\nAugmented Lagrangian techniques for elliptic state constrained optimal control problems,\nSIAM J. Control Optim. 35 (1997), no. 5, 1524\u20131543.","DOI":"10.1137\/S036301299529330X"},{"key":"2023070413382941006_j_cmam-2022-0148_ref_009","unstructured":"M. Bergounioux and K. Kunisch,\nPrimal-dual strategy for state-constrained optimal control problems,\nComput. Optim. Appl. 22 (2002), no. 2, 193\u2013224."},{"key":"2023070413382941006_j_cmam-2022-0148_ref_010","doi-asserted-by":"crossref","unstructured":"H. Blum and R. Rannacher,\nOn the boundary value problem of the biharmonic operator on domains with angular corners,\nMath. Methods Appl. 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Dauge,\nElliptic Boundary Value Problems on Corner Domains,\nLecture Notes in Math. 1341,\nSpringer, Berlin, 1988.","DOI":"10.1007\/BFb0086682"},{"key":"2023070413382941006_j_cmam-2022-0148_ref_038","doi-asserted-by":"crossref","unstructured":"M. Dauge, S. Nicaise, M. Bourlard and J. M.-S. Lubuma,\nCoefficients des singularit\u00e9s pour des probl\u00e8mes aux limites elliptiques sur un domaine \u00e0 points coniques. II. Quelques op\u00e9rateurs particuliers,\nRAIRO Mod\u00e9l. Math. Anal. Num\u00e9r. 24 (1990), no. 3, 343\u2013367.","DOI":"10.1051\/m2an\/1990240303431"},{"key":"2023070413382941006_j_cmam-2022-0148_ref_039","doi-asserted-by":"crossref","unstructured":"T. Dupont and R. Scott,\nPolynomial approximation of functions in Sobolev spaces,\nMath. Comp. 34 (1980), no. 150, 441\u2013463.","DOI":"10.1090\/S0025-5718-1980-0559195-7"},{"key":"2023070413382941006_j_cmam-2022-0148_ref_040","doi-asserted-by":"crossref","unstructured":"I. Ekeland and R. T\u00e9mam,\nConvex Analysis and Variational Problems,\nClass. Appl. Math. 28,\nSociety for Industrial and Applied Mathematics, Philadelphia, 1999.","DOI":"10.1137\/1.9781611971088"},{"key":"2023070413382941006_j_cmam-2022-0148_ref_041","doi-asserted-by":"crossref","unstructured":"Y. Epshteyn and B. Rivi\u00e8re,\nEstimation of penalty parameters for symmetric interior penalty Galerkin methods,\nJ. Comput. Appl. Math. 206 (2007), no. 2, 843\u2013872.","DOI":"10.1016\/j.cam.2006.08.029"},{"key":"2023070413382941006_j_cmam-2022-0148_ref_042","unstructured":"L. C. Evans,\nPartial Differential Equations, 2nd ed.,\nGrad. Stud. Math. 19,\nAmerican Mathematical Society, Providence, 2010."},{"key":"2023070413382941006_j_cmam-2022-0148_ref_043","doi-asserted-by":"crossref","unstructured":"J. Frehse,\nZum Differenzierbarkeitsproblem bei Variationsungleichungen h\u00f6herer Ordnung,\nAbh. Math. Semin. Univ. 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Math. 27 (2009), no. 1, 97\u2013114."},{"key":"2023070413382941006_j_cmam-2022-0148_ref_054","unstructured":"C. Meyer,\nError estimates for the finite-element approximation of an elliptic control problem with pointwise state and control constraints,\nControl Cybernet. 37 (2008), no. 1, 51\u201383."},{"key":"2023070413382941006_j_cmam-2022-0148_ref_055","doi-asserted-by":"crossref","unstructured":"I. Neitzel, J. Pfefferer and A. R\u00f6sch,\nFinite element discretization of state-constrained elliptic optimal control problems with semilinear state equation,\nSIAM J. Control Optim. 53 (2015), no. 2, 874\u2013904.","DOI":"10.1137\/140960645"},{"key":"2023070413382941006_j_cmam-2022-0148_ref_056","unstructured":"M. Pierre and J. Soko\u0142 owski,\nDifferentiability of projection and applications,\nControl of Partial Differential Equations and Applications,\nLect. Notes Pure Appl. 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