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2024. Error Estimates for Finite Element Approximation to Elliptic Optimal Control Problems with Boundary Observations in $H^{-\frac{1}{2}}(\Gamma)$. Advances in Applied Mathematics and Mechanics. 16, 5 (July 2024), 1152–1175. DOI:https://doi.org/10.4208/aamm.OA-2022-0172.