@InProceedings{Kontkanen2005i3d,
  author =    {Janne Kontkanen and Samuli Laine},
  title =     {Ambient Occlusion Fields},
  booktitle = {Proceedings of ACM SIGGRAPH 2005 Symposium on Interactive 3D Graphics and Games},
  pages =     {41--48},
  year =      {2005},
  publisher = {ACM Press},
}