@incollection {MR3977005,
    AUTHOR = {Congreve, Scott and Gedicke, Joscha and Perugia, Ilaria},
     TITLE = {Numerical investigation of the conditioning for plane wave
              discontinuous {G}alerkin methods},
 BOOKTITLE = {Numerical mathematics and advanced applications---{ENUMATH}
              2017},
    SERIES = {Lect. Notes Comput. Sci. Eng.},
    VOLUME = {126},
     PAGES = {493--500},
 PUBLISHER = {Springer, Cham},
      YEAR = {2019},
      ISBN = {978-3-319-96415-7; 978-3-319-96414-0},
   MRCLASS = {65N30 (65N22)},
  MRNUMBER = {3977005},
       DOI = {10.1007/978-3-319-96415-7\_44},
       URL = {https://doi.org/10.1007/978-3-319-96415-7_44},
       EPRINT = {1712.05174},
}