@inproceedings{bridges2013:499,
  author      = {Ruttkay, Zs\'{o}fia and Juh\'{a}sz, Litza},
  title       = {The 3D Effect of Bull by Vasarely},
  pages       = {499--502},
  booktitle   = {Proceedings of Bridges 2013: Mathematics, Music, Art, Architecture, Culture},
  year        = {2013},
  editor      = {Hart, George W. and Sarhangi, Reza},
  isbn        = {978-1-938664-06-9},
  issn        = {1099-6702},
  publisher   = {Tessellations Publishing},
  address     = {Phoenix, Arizona},

  url         = {http://archive.bridgesmathart.org/2013/bridges2013-499.html}
}