• DOI https://doi.org/10.18177/sym.2017.57.fr.11357
  • PDF https://www.jstor.org/stable/26574457

  • DOI http://dx.doi.org/10.18177/sym.2015.55.sr.10889
  • PDF https://www.jstor.org/stable/26574402

  • DOI http://dx.doi.org/10.18177/sym.2015.55.rev.10880
  • PDF https://www.jstor.org/stable/26574405
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