@misc{indiciae2be6caa64bc4,
  title = {The reduction of remote sensing data by visual means},
  author = {Colwell, R. N. and Poulton, C. E. and Schrumpf, B. J.},
  year = {1980},
  url = {https://ntrs.nasa.gov/citations/19800011735},
  note = {Source identifier: 19800011735}
}