@misc{indiciaed3ea37572f6e,
  title = {Computational methods for inverse problems in geophysics: Inversion of travel time observations},
  author = {V. Pereyra and H.B. Keller and W.H.K. Lee},
  year = {1980},
  doi = {10.1016/0031-9201(80)90063-1},
  url = {https://pubs.usgs.gov/publication/70012330},
  note = {Source identifier: 70012330}
}