@Article{VPBGS09,
  author       = "Vergne, Romain and Pacanowski, Romain and Barla, Pascal and Granier, Xavier and Schlick, Christophe",
  title        = "Light Warping for Enhanced Surface Depiction",
  journal      = "ACM Transaction on Graphics (Proceedings of SIGGRAPH 2009)",
  number       = "3",
  volume       = "28",
  month        = "Aug",
  year         = "2009",
  keywords     = "expressive rendering, shading, perception, enhancement, rendering",
  url          = "http://iparla.labri.fr/publications/2009/VPBGS09"
}