@misc{indiciae894e74d5a32a,
  title = {A transportable hemispherical illumination system for making reflectance factor measurements},
  author = {Williams, Darrel L. and Wood, Frank M., Jr.},
  year = {1987},
  url = {https://ntrs.nasa.gov/citations/19880031646},
  note = {Source identifier: 19880031646}
}