• DOI http://dx.doi.org/10.18177/sym.2014.54.fr.10535
  • PDF https://www.jstor.org/stable/26574385

  • PDF https://www.jstor.org/stable/40374506

  • PDF https://www.jstor.org/stable/40374437

  • PDF https://www.jstor.org/stable/40374439

  • PDF https://www.jstor.org/stable/40374519