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@ARTICLE{Kleefeld:827640,
      author       = {Kleefeld, Andreas},
      title        = {{T}he exterior problem for the {H}elmholtz equation with
                      mixed boundary conditions in three dimensions},
      journal      = {International journal of computer mathematics},
      volume       = {89},
      number       = {17},
      issn         = {1029-0265},
      address      = {London [u.a.]},
      publisher    = {Taylor and Francis},
      reportid     = {FZJ-2017-01754},
      pages        = {2392 - 2409},
      year         = {2012},
      ddc          = {510},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1080/00207160.2012.709932},
      url          = {https://juser.fz-juelich.de/record/827640},
}