@misc{indiciae339c11d0889f,
  title = {Apollo in lunar orbit},
  author = {Esenwein, G. F. and Roberson, F. I. and Winterhalter, D. L.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19710043476},
  note = {Source identifier: 19710043476}
}