Cloaking via change of variables in electric impedance tomography

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Electrical impedance tomography and Calderón's problem (2009, background): “The same basic construction works in the two-dimensional case [79].”
Spectral Theory of a Neumann–Poincaré-Type Operator and Analysis of Cloaking Due to Anomalous Localized Resonance (2011, background): “Many schemes are under active current investigation [12, 1, 21, 35, 26, 8, 19, 11, 22, 24, 13, 20, 18].”
Acoustic cloaking theory (2008, background): “ be deﬁned in many ways: for instance, a power law f(r) = b r−δ b−δ α with 0 < δ < a is considered in [22]. Here we assume a linear near-cloak mapping similar to the one examined by Kohn et al. [20], f(δ)(r) = b r −a b−a +δ b−r b−a , (64) where 0 < δ < a. Hence, f(δ)(a) = δ and the radiu”
Cloaking via change of variables for the Helmholtz equation (2010, background): “Such a statement is true at frequency 0; this is the main resul t of [15].”