@misc{indiciae87b196c6f2ed,
  title = {Effects of changing canopy directional reflectance on feature selection},
  author = {Smith, J. A. and Oliver, R. E. and Kilpela, O. E.},
  year = {1973},
  url = {https://ntrs.nasa.gov/citations/19740042671},
  note = {Source identifier: 19740042671}
}