• DOI http://dx.doi.org/10.18177/sym.2014.54.sr.10853

  • DOI http://dx.doi.org/10.18177/sym.2014.54.sr.10850

  • DOI http://dx.doi.org/10.18177/sym.2014.54.itm.10848

  • DOI http://dx.doi.org/10.18177/sym.2014.54.itm.10847
  • PDF https://www.jstor.org/stable/26574362

  • DOI http://dx.doi.org/10.18177/sym.2014.54.sr.10550