• DOI https://doi.org/10.18177/sym.2020.60.rev.11484
  • PDF https://www.jstor.org/stable/26989805

  • DOI https://doi.org/10.18177/sym.2020.60.sr.11498
  • PDF https://www.jstor.org/stable/26989791

  • DOI http://dx.doi.org/10.18177/sym.2015.55.rev.10867
  • PDF https://www.jstor.org/stable/26574408

  • DOI http://dx.doi.org/10.18177/sym.2014.54.sr.10844
  • PDF https://www.jstor.org/stable/26574363

  • DOI http://dx.doi.org/10.18177/sym.2013.53.sr.10308
  • PDF https://www.jstor.org/stable/26564917