@misc{indiciae9612d01c2011,
  title = {The Cretaceous-Tertiary (K/T) impact: One or more source craters?},
  author = {Koeberl, Christian},
  year = {1992},
  url = {https://ntrs.nasa.gov/citations/19930000965},
  note = {Source identifier: 19930000965}
}