@misc{indiciae17d3c359c572,
  title = {Four hour lunar normal and alternate missions Preliminary study},
  author = {Beattie, D. A. and Davin, E. and Lowman, P. D., Jr.},
  year = {1964},
  url = {https://ntrs.nasa.gov/citations/19660009388},
  note = {Source identifier: 19660009388}
}