@Article{        ramsey:2004,
  author = 	 "Shaun Ramsey and Kristin Potter and Charles Hansen",
  title = 	 "Ray Bilinear Patch Intersections",
  journal = 	 "Journal of Graphics Tools",
  year = 	 "2004",
  volume = 	 "9",
  number = 	 "3",
  pages = 	 "41--47",
}