@misc{indiciae2f409918e23d,
  title = {Multifrequency, Multipolarization External Calibration of the SIR-C/X-SAR Radars},
  author = {Anthony Freeman and K Sarabandi},
  year = {1996},
  url = {https://ntrs.nasa.gov/citations/19980015286},
  note = {Source identifier: 19980015286}
}