@misc{indiciae33cf9289f4a3,
  title = {Cratering Rates in the Outer Solar System},
  author = {Zahnle, K. and Schenk, P. and Dones, L. and Levison, H.},
  year = {2003},
  url = {https://ntrs.nasa.gov/citations/20030111587},
  note = {Source identifier: 20030111587}
}