@misc{indiciae1769ddd5108a,
  title = {An inverse method using toroidal mode data},
  author = {C. Willis},
  year = {1999},
  doi = {10.1088/0266-5611/2/1/009},
  url = {https://pubs.usgs.gov/publication/70182144},
  note = {Source identifier: 70182144}
}