@inproceedings{rodenparberry2005,
  author = {T. Roden and I. Parberry}, 
  title = {Clouds and Stars: Efficient Real-Time Procedural Sky Rendering Using {3D} Hardware},
  booktitle = {Proceedings of the 2005 ACM SIGCHI International Conference on Advances in
     Computer Entertainment Technology},
  city = {Valencia, Spain}, 
  pages = {434--437}, 
  year = 2005,
}