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![HelmPole - A finite element solver for scattering problems ...webdoc.sub.gwdg.de/ebook/serien/ah/reports/zib/zib...method (PML method) originally introduced by Ber enger, cf. [1].](https://static.fdocuments.net/doc/165x107/611601cc62fa0e54951a7dd5/helmpole-a-inite-element-solver-for-scattering-problems-method-pml.jpg)
