@techreport{HohageSchmidtZschiedrich2001, author = {Thorsten Hohage and Frank Schmidt and Lin Zschiedrich}, title = {Solving time-harmonic scattering problems based on the condition: Theory}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {01-01}, language = {eng}, year = {2001} }