@misc{indiciae08ad36524abd,
  title = {Attitude-referenced radiometer study. Part 2: Primary calibration system},
  author = {Williamson, W. R. and Otte, A. A.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19720011866},
  note = {Source identifier: 19720011866}
}