@misc{indiciaec9c5c01dfc98,
  title = {Lunar astronomical observatories - Design studies},
  author = {Johnson, Stewart W. and Burns, Jack O. and Chua, Koon Meng and Duric, Nebojsa and Gerstle, Walter H.},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19900065696},
  note = {Source identifier: 19900065696}
}