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

  • DOI http://dx.doi.org/10.18177/sym.2011.51.sr.12
  • PDF https://www.jstor.org/stable/26513067

  • PDF https://www.jstor.org/stable/40374438

  • PDF https://www.jstor.org/stable/40374041
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