@misc{indiciae48af7d43ffc1,
  title = {Seismological mapping of fine structure near the base of the Earth's mantle},
  author = {J.E. Vidale and H.M. Benz},
  year = {1993},
  doi = {10.1038/361529a0},
  url = {https://pubs.usgs.gov/publication/70018380},
  note = {Source identifier: 70018380}
}