@article{Purcell:2002:RTO,
  author = "Timothy J. Purcell and Ian Buck and William R. Mark and Pat Hanrahan",
  title = "Ray Tracing on Programmable Graphics Hardware",
  year = "2002",
  month = "July",
  journal = "ACM Transactions on Graphics",
  volume = "21",
  number = "3",
  pages = "703--712",
  note = "ISSN 0730-0301 (Proceedings of ACM SIGGRAPH 2002)",
}