• DOI https://doi.org/10.18177/sym.2020.60.fr.11475
  • PDF https://www.jstor.org/stable/26919808

  • DOI http://dx.doi.org/10.18177/sym.2016.56.rev.11132
  • PDF https://www.jstor.org/stable/26574436

  • DOI http://dx.doi.org/10.18177/sym.2015.55.rev.10868
  • PDF https://www.jstor.org/stable/26574407