@misc{indiciae74e2fcb1dba3,
  title = {Impact Crises, Mass Extinctions, and Galactic Dynamics: A Unified Theory},
  author = {Rampino, M.R.},
  year = {1997},
  url = {https://ntrs.nasa.gov/citations/20000031491},
  note = {Source identifier: 20000031491}
}