@misc{indiciae9ff4e5e25fb9,
  title = {Surface characterizations of color threshold},
  author = {Poirson, Allen B. and Wandell, Brian A. and Varner, Denise C. and Brainard, David H.},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19900042788},
  note = {Source identifier: 19900042788}
}