@misc{indiciaec63380fe168d,
  title = {Uniform, variable light sources for instrument calibration.},
  author = {Rennilson, J. J. and Squyres, H. P.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19690061591},
  note = {Source identifier: 19690061591}
}