• DOI http://dx.doi.org/10.18177/sym.2011.51.sr.18
  • PDF https://www.jstor.org/stable/26513061

  • DOI http://dx.doi.org/10.18177/sym.2011.51.sr.14
  • PDF https://www.jstor.org/stable/26513065

  • DOI http://dx.doi.org/10.18177/sym.2011.51.sr.766
  • PDF https://www.jstor.org/stable/26513058

  • PDF https://www.jstor.org/stable/41225256

  • PDF https://www.jstor.org/stable/25664809
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