• DOI http://doi.org/10.18177/sym.2018.58.fr.11382
  • PDF https://www.jstor.org/stable/26564932

  • DOI http://dx.doi.org/10.18177/sym.2013.53.sr.10297

  • PDF https://www.jstor.org/stable/41225268

  • PDF https://www.jstor.org/stable/40374328
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