• DOI http://dx.doi.org/10.18177/sym.2015.55.itm.10875
  • PDF https://www.jstor.org/stable/26574397

  • PDF https://www.jstor.org/stable/40374328

  • PDF https://www.jstor.org/stable/40373743

  • PDF https://www.jstor.org/stable/40373745
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