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

  • DOI http://dx.doi.org/10.18177/sym.2011.51.sr.12
  • PDF https://www.jstor.org/stable/26513067

  • DOI http://dx.doi.org/10.18177/sym.2011.51.sr.11
  • PDF https://www.jstor.org/stable/26513068

  • DOI http://dx.doi.org/10.18177/sym.2011.51.rev.479
  • PDF https://www.jstor.org/stable/26513071

  • DOI http://dx.doi.org/10.18177/sym.2011.51.fr.8945
  • PDF https://www.jstor.org/stable/26513073
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