@misc{indiciae5c0f3af454c2,
  title = {Late Frasnian mass extinction: Conodont event stratigraphy, global changes, and possible causes},
  author = {Sandberg, Charles A. and Ziegler, Willi and Dreesen, Roland and Butler, Jamie L.},
  year = {1988},
  url = {https://ntrs.nasa.gov/citations/19890012009},
  note = {Source identifier: 19890012009}
}