@inproceedings{Schmidt2000, author = {Frank Schmidt}, title = {Discrete Nonreflecting Boundary Conditions for the Helmholtz equation}, booktitle = {Fifth International Conference on Mathematical and Numerical Aspects of Wave Propagation}, editor = {A. Berm{\´u}dez and D. G{\´o}mez and C. Hazard and P. Joly and J. Roberts}, pages = {921 -- 925}, url = {http://www.zib.de/Publications/Reports/ZR-00-06.pdf}, year = {2000}, }