@misc{indiciaee2b2587414ce,
  title = {Guide star targeting success for the HEAO-B observatory},
  author = {Farrenkopf, R. L. and Hoffman, D. P.},
  year = {1977},
  url = {https://ntrs.nasa.gov/citations/19770059904},
  note = {Source identifier: 19770059904}
}