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@ARTICLE{Kleefeld:827637,
      author       = {Kleefeld, Andreas and Lin, Tzu-Chu},
      title        = {{A} {G}lobal {G}alerkin {M}ethod for {S}olving the
                      {E}xterior {N}eumann {P}roblem for the {H}elmholtz
                      {E}quation {U}sing {P}anich's {I}ntegral {E}quation
                      {A}pproach},
      journal      = {SIAM journal on scientific computing},
      volume       = {35},
      number       = {3},
      issn         = {1095-7197},
      address      = {Philadelphia, Pa.},
      publisher    = {SIAM},
      reportid     = {FZJ-2017-01751},
      pages        = {A1709 - A1735},
      year         = {2013},
      ddc          = {004},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1137/120873066},
      url          = {https://juser.fz-juelich.de/record/827637},
}