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The 8 references without a DOI — listed, not checked
no DOI — not checkedDomain decomposition method and the Helmholtz problem
no DOI — not checkedDécomposition de domaine et problème de Helmholtz
no DOI — not checkedSome numerical method of solving Helmholtz wave equation
no DOI — not checkedF. Nataf, F. Rogier, E. de Sturler, Optimal interface conditions for domain decomposition methods, Technical Report 301, Ecole Polytechnique, CMAP, 1994.
no DOI — not checkedA. Toselli, Some results on overlapping Schwarz methods for the Helmholtz equation employing perfectly matched layers, Technical Report 765, New York University, 1998. <Cs.nyu.edu/web/Research/TechReports/TR1998-765/TR1998-765.pdf>.
no DOI — not checkedWhy it is difficult to solve Helmholtz problems with classical iterative methods?
no DOI — not checkedS.G. Johnson, Notes on perfectly matched layers, 2010. <http://math.mit.edu/stevenj/18.369/pml.pdf>.
no DOI — not checkedJ. Poulson, B. Engquist, S. Fomel, S. Li, L. Ying, A parallel sweeping preconditioner for high-frequency heterogeneous 3-D Helmholtz equations, Technical Report, University of Texas at Austin, 2012. <http://www.math.utexas.edu/users/lexing/publications/parallelsweeping.pdf>.
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