@misc{indiciae81a514f5e82b,
  title = {Space astronomy},
  author = {Cameron, A. G. W. and Gleim, J. K. and Haddock, F. T.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19670009694},
  note = {Source identifier: 19670009694}
}