@misc{indiciae19b4747f2fc7,
  title = {Scattered P'P' waves observed at short distances},
  author = {Paul S. Earle and Sebastian Rost and Peter M. Shearer and Christine Thomas},
  year = {2011},
  doi = {10.1785/0120110157},
  url = {https://pubs.usgs.gov/publication/70032547},
  note = {Source identifier: 70032547}
}