@misc{indiciae1ae5fb213a85,
  title = {Travel times of P and S from the global digital seismic networks: Implications for the relative variation of P and S velocity in the mantle},
  author = {H. Bolton and G. Masters},
  year = {2001},
  doi = {10.1029/2000jb900378},
  url = {https://pubs.usgs.gov/publication/70023278},
  note = {Source identifier: 70023278}
}