@misc{indiciae5361aa2b5c25,
  title = {Device for determining relative angular position between a spacecraft and a radiation emitting celestial body},
  author = {Farthing, W. H. and Frisbie, H. F.},
  year = {1973},
  url = {https://ntrs.nasa.gov/citations/19730019758},
  note = {Source identifier: 19730019758}
}