@Article{SCI:Han2019a,
  author =    "M. Han and I. Wald and W. Usher and Q. Wu and F.
              Wang and V. Pascicci and C. D. Hansen and C. R.
              Johnson",
  title =     "Ray Tracing Generalized Tube Primitives: Method
              and Applications",
  journal =   "Computer Graphics Forum",
  volume =    "38",
  number =    "3",
  year =      "2019",
  publisher = "John Wiley \& Sons Ltd.",
  url =       "http://www.sci.utah.edu/publications/Han2019a/tubes-final.pdf",
}