• DOI https://doi.org/10.18177/sym.2017.57.rev.11362
  • PDF https://www.jstor.org/stable/26574468

  • DOI https://doi.org/10.18177/sym.2017.57.fr.11350

  • DOI https://doi.org/10.18177/sym.2017.57.rev.11335
  • PDF https://www.jstor.org/stable/26574469

  • PDF https://www.jstor.org/stable/40376022
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