@inproceedings{bridges2011:447,
  author      = {Huylebrouck, Dirk},
  title       = {Soccer Balls},
  pages       = {447--450},
  booktitle   = {Proceedings of Bridges 2011: Mathematics, Music, Art, Architecture, Culture},
  year        = {2011},
  editor      = {Sarhangi, Reza and S\'{e}quin, Carlo H.},
  isbn        = {978-0-9846042-6-5},
  issn        = {1099-6702},
  publisher   = {Tessellations Publishing},
  address     = {Phoenix, Arizona},

  url         = {http://archive.bridgesmathart.org/2011/bridges2011-447.html}
}