• DOI https://doi.org/10.18177/sym.2020.60.fr.11473
  • PDF https://www.jstor.org/stable/26919810

  • DOI http://dx.doi.org/10.18177/sym.2013.53.sr.9574
  • PDF https://www.jstor.org/stable/26564911

  • PDF https://www.jstor.org/stable/40374218
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