Recovering the conductivity at the boundary from the Dirichlet to Neumann map: a pointwise result

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Identifiability at the boundary for first-order terms (2006, methodology): “By contrast, the recovery of a conductivity in the work of Brown [2] only requires the standard energy estimate for the gradient of a solution.”
Inverse Problems for Nonsmooth First Order Perturbations of the Laplacian (2004, methodology): “Nachman-Sylvester-Uhlmann [27] proved the result for σ ∈W 2,∞, Brown [8] for σ ∈ C3/2+ε using singular zero order perturbations of ∆, Päivärinta-Panchenko-Uhlmann [34] for σ ∈ C3/2 by convolution approximation, and Brown-Torres [10] for σ ∈W 3/2,2n+ε. Uniqueness for C1+ε conormal conductivities wa”
Inverse problems: seeing the unseen (2014, background): “For other results and approaches to boundary determination of the conductivity see [5,31,135,141].”
Electrical impedance tomography and Calderón's problem (2009, background): “For other results and approaches to boundary determination of the conductivity see [4], [18], [92], [97].”
Stability of Calderón inverse conductivity problem in the plane (2007, background): “This is the content of the following proposition which follows easily from [14].”
GLOBAL UNIQUENESS FOR THE CALDERÓN PROBLEM WITH LIPSCHITZ CONDUCTIVITIES (2014, unknown): “Brown [5], we know that γ1|∂Ω = γ2|∂Ω.”