• DOI https://doi.org/10.18177/sym.2016.56.sr.11225
  • PDF https://www.jstor.org/stable/26574426

  • DOI https://doi.org/10.18177/sym.2016.56.rev.11151
  • PDF https://www.jstor.org/stable/26574440

  • DOI http://dx.doi.org/10.18177/sym.2014.54.sr.10629
  • PDF https://www.jstor.org/stable/26574366

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

  • PDF https://www.jstor.org/stable/40374522