• DOI http://dx.doi.org/10.18177/sym.2016.56.sr.11126
  • PDF https://www.jstor.org/stable/26574430

  • PDF https://www.jstor.org/stable/25664814

  • PDF https://www.jstor.org/stable/40374251

  • PDF https://www.jstor.org/stable/40374140
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