@misc{indiciae2f2496890859,
  title = {Crop classification using multidate/multifrequency radar data},
  author = {Ulaby, F. T. and Shanmugam, K. S. and Narayanan, V. and Dobson, C.},
  year = {1981},
  url = {https://ntrs.nasa.gov/citations/19820016683},
  note = {Source identifier: 19820016683}
}