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2. Integral Equation Methods in Scattering Methods in Scattering Theory;Colton,1983
3. Inverse Acoustic and Electromagnetic Scattering Theory;Colton,1992
4. Nodal sets of eigenfunctions on Riemannian manifolds;Donnelly;Invent. Math.,1988
5. Nodal sets of eigenfunctions: Riemannian manifolds with boundary;Donnelly,1990