• DOI http://dx.doi.org/10.18177/sym.2015.55.fr.10859
  • PDF https://www.jstor.org/stable/26574417

  • DOI http://dx.doi.org/10.18177/sym.2013.53.fr.9813
  • PDF https://www.jstor.org/stable/26564926

  • PDF https://www.jstor.org/stable/41225230

  • PDF https://www.jstor.org/stable/40374517
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