• DOI https://doi.org/10.18177/sym.2020.60.sr.11480
  • PDF https://www.jstor.org/stable/26919803

  • 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.2013.53.fr.10372
  • PDF https://www.jstor.org/stable/26564927