• DOI http://dx.doi.org/10.18177/sym.2013.53.sr.10294
  • PDF https://www.jstor.org/stable/26564910

  • DOI http://dx.doi.org/10.18177/sym.2012.52.rev.8997
  • PDF https://www.jstor.org/stable/26564878

  • DOI http://dx.doi.org/10.18177/sym.2011.51.sr.767
  • PDF https://www.jstor.org/stable/26513057

  • DOI http://dx.doi.org/10.18177/sym.2011.51.sr.768
  • PDF https://www.jstor.org/stable/26513056

  • PDF https://www.jstor.org/stable/25664815
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