@misc{indiciae5c4bae880890,
  title = {Mantle discontinuities under southern Africa from precursors to P′ P′ df},
  author = {Fei Xu and John E. Vidale and Paul S. Earle and Harley M. Benz},
  year = {1998},
  doi = {10.1029/98gl00122},
  url = {https://pubs.usgs.gov/publication/70020634},
  note = {Source identifier: 70020634}
}