• DOI http://dx.doi.org/10.18177/sym.2012.52.sr.924
  • PDF https://www.jstor.org/stable/26564877

  • PDF https://www.jstor.org/stable/40374495

  • PDF https://www.jstor.org/stable/40374312

  • PDF https://www.jstor.org/stable/40373923
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