• DOI http://dx.doi.org/10.18177/sym.2012.52.sr.21
  • PDF https://www.jstor.org/stable/26564873

  • PDF https://www.jstor.org/stable/25664811

  • PDF https://www.jstor.org/stable/40374439

  • PDF https://www.jstor.org/stable/40374125
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