@article{HohageSchmidtZschiedrich2003, author = {Thorsten Hohage and Frank Schmidt and Lin Zschiedrich}, title = {Solving Time-Harmonic Scattering Problems Based on the Pole Condition I: Theory}, journal = {SIAM J. Math. Anal.}, volume = {35}, number = {1}, pages = {183 -- 210}, doi = {10.1137/S0036141002406473}, year = {2003}, }