@misc{indiciae383e045a9be4,
  title = {Planetary astronomy},
  author = {Chapman, C. R. and Davis, D. R. and Howell, S. B. and Weidenschilling, S. J.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19920003586},
  note = {Source identifier: 19920003586}
}