• DOI http://dx.doi.org/10.18177/sym.2015.55.rev.10860
  • PDF https://www.jstor.org/stable/26574409

  • DOI http://dx.doi.org/10.18177/sym.2014.54.rev.10671
  • PDF https://www.jstor.org/stable/26574380

  • DOI http://dx.doi.org/10.18177/sym.2014.54.fr.10536
  • PDF https://www.jstor.org/stable/26574390
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