@misc{indiciaefc31dc640153,
  title = {Polarimetric SAR calibration experiment using active radar calibrators},
  author = {Freeman, Anthony and Shen, Yuhsyen and Werner, Charles L.},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19900043597},
  note = {Source identifier: 19900043597}
}