Formula for the size of the scatterer is derived explicitly in terms of the scattering amplitude corresponding to this scatterer. By the scatterer either a bounded obstacle $D$ or the support of the compactly supported potential is meant
Increasing stability for near field from the scattering amplitude
Stability of the determination of the surface impedance of an obstacle from the scattering amplitude
On the boundary conditions in estimating $\nabla ω$ by div $ω$ and curl $ω.$
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