@misc{indiciaee32f21da1f41,
  title = {RayGUI 2.0: a graphical user interface for interactive forward and inversion ray-tracing},
  author = {Jian-Li Song and Uri S. ten Brink},
  year = {2004},
  doi = {10.3133/ofr20041426},
  url = {https://pubs.usgs.gov/publication/ofr20041426},
  note = {Source identifier: ofr20041426}
}