@misc{indiciae9dcb77627491,
  title = {A CCD tracker for closed-loop instrument pointing at Halley's comet},
  author = {Stanton, R. H. and Armstrong, R. W.},
  year = {1981},
  url = {https://ntrs.nasa.gov/citations/19810036188},
  note = {Source identifier: 19810036188}
}