@misc{indiciae41a46cb4fc5c,
  title = {Use of libration-point orbits for space observatories},
  author = {Farquhar, Robert W. and Dunham, David W.},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19930039435},
  note = {Source identifier: 19930039435}
}