@inproceedings{VV11AlchemyAO,
  author = {Morgan McGuire and Brian Osman and Michael Bukowski and Padraic Hennessy},
  title = {The Alchemy Screen-Space Ambient Obscurance Algorithm},
  month = {August},
  year = {2011},
  booktitle = {High-Performance Graphics 2011},
  location = {Vancouver, BC, Canada},
  url = {http://graphics.cs.williams.edu/papers/AlchemyHPG11/}
}