• DOI https://doi.org/10.18177/sym.2018.58.sr.11367
  • PDF https://www.jstor.org/stable/26564931

  • DOI https://doi.org/10.18177/sym.2017.57.sr.11365
  • PDF https://www.jstor.org/stable/26574456

  • DOI 10.18177/sym.2017.57.sr.11364
  • PDF https://www.jstor.org/stable/26574459

  • DOI https://doi.org/10.18177/sym.2017.57.sr.11363
  • PDF https://www.jstor.org/stable/26574461

  • DOI https://doi.org/10.18177/sym.2017.57.sr.11366
  • PDF https://www.jstor.org/stable/26574462