@article{SchmidtHohageKloseetal.2008, author = {Frank Schmidt and Thorsten Hohage and Roland Klose and Achim Sch{\"a}dle and Lin Zschiedrich}, title = {Pole condition: A numerical method for Helmholtz-type scattering problems with inhomogeneous exterior domain}, journal = {J. Comput. Appl. Math.}, volume = {218}, number = {1}, pages = {61 -- 69}, doi = {10.1016/j.cam.2007.04.046}, year = {2008}, }