Icon, Index, and Symbol. Burks, A. W. 9(4):673–689.
Icon, Index, and Symbol [link]Paper  bibtex   
@article{burks1949,
  author = {Arthur W. Burks},
  date = {1949},
  journaltitle = {Philosophy and Phenomenological Research},
  number = {4},
  pages = {673--689},
  title = {Icon, Index, and Symbol},
  url = {http://www.jstor.org/stable/2103298},
  volume = {9},
}
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