@inproceedings{bridges2009:163,
  author      = {Dunham, Douglas},
  title       = {The Symmetry of ``Circle Limit IV'' and Related Patterns},
  pages       = {163--168},
  booktitle   = {Proceedings of Bridges 2009: Mathematics, Music, Art, Architecture, Culture},
  year        = {2009},
  editor      = {Kaplan, Craig S. and Sarhangi, Reza},
  isbn        = {978-0-96652-020-0},
  issn        = {1099-6702},
  publisher   = {Tarquin Publications},
  address     = {London},

  url         = {http://archive.bridgesmathart.org/2009/bridges2009-163.html}
}