• DOI http://dx.doi.org/10.18177/sym.2015.55.fr.10885
  • PDF https://www.jstor.org/stable/26574416

  • DOI http://dx.doi.org/10.18177/sym.2012.52.sr.20
  • PDF https://www.jstor.org/stable/26564876

  • PDF https://www.jstor.org/stable/40374471

  • PDF https://www.jstor.org/stable/40374425