@misc{indiciae3ec9abb53921,
  title = {Whence comets?},
  author = {Michael F A'Hearn},
  year = {2006},
  doi = {10.1126/science.1137083},
  url = {https://pubmed.ncbi.nlm.nih.gov/17170287/},
  note = {Source identifier: 17170287}
}