• DOI https://doi.org/10.18177/sym.2016.56.fr.11155
  • PDF https://www.jstor.org/stable/26574449

  • DOI http://dx.doi.org/10.18177/sym.2015.55.fr.10883
  • PDF https://www.jstor.org/stable/26574418

  • PDF https://www.jstor.org/stable/41225248