• DOI http://dx.doi.org/10.18177/sym.2015.55.itm.10865
  • PDF https://www.jstor.org/stable/26574398

  • DOI http://dx.doi.org/10.18177/sym.2014.54.sr.10628

  • PDF https://www.jstor.org/stable/40373849

  • PDF https://www.jstor.org/stable/40373737
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