• DOI http://dx.doi.org/10.18177/sym.2016.56.rev.11109
  • PDF https://www.jstor.org/stable/26574434

  • DOI http://dx.doi.org/10.18177/sym.2014.54.rev.10692
  • PDF https://www.jstor.org/stable/26574379

  • PDF https://www.jstor.org/stable/40374429

  • PDF https://www.jstor.org/stable/40374131

  • PDF https://www.jstor.org/stable/40374031
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