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  3. T. Friese, P. Deuflhard, F. Schmidt: A Multigrid Method for the Complex Helmholtz Eigenvalue Problem. In: Choi-Hong Lai, Peter E. Bjørstad, Mark Cross and Olof O. Widlund (eds.), Procs. Eleventh International Conference on Domain Decomposition Methods, DDM-org Press, Bergen, pp. 18-26 (1999).

  4. P. Deuflhard, T. Friese, F. Schmidt, R. März, H.-P. Nolting: Effiziente Eigenmodenberechnung für den Entwurf integriert-optischer Chips. In: K.-H. Hoffmann, W. Jäger, T. Lohmann, H. Schunk (eds.), Mathematik. Schlüsseltechnologie für die Zukunft, pp. 267-279, Springer (1996).