@inproceedings{Kosloff:2009:TTR,
  title = {Three Techniques for Rendering Generalized Depth of Field Effects},
  booktitle = {Proceedings of the Fourth SIAM Conference on Mathematics for Industry: Challenges and Frontiers (MI09)},
  author = {Todd J. Kosloff and Brian A. Barsky},
  month = {October},
  year = 2009,
  pages = {42--48},
  url = {http://graphics.berkeley.edu/papers/Kosloff-TTR-2009-10/},
}