• DOI http://dx.doi.org/10.18177/sym.2015.55.rev.10862
  • PDF https://www.jstor.org/stable/26574404

  • PDF https://www.jstor.org/stable/40374098

  • PDF https://www.jstor.org/stable/40374099

  • PDF https://www.jstor.org/stable/40373976

  • PDF https://www.jstor.org/stable/40373179
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