@misc{indiciaeb1c10050f9cc,
  title = {Lunar and planetary mass concentrations.},
  author = {Campbell, M. J. and Oleary, B. T. and Sagan, C.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19690060991},
  note = {Source identifier: 19690060991}
}