@misc{indiciae34a68c970a29,
  title = {Nonlinear refraction and reflection travel time tomography},
  author = {Jiahua Zhang and Uri S. ten Brink and M.N. Toksoz},
  year = {1998},
  doi = {10.1029/98jb01981},
  url = {https://pubs.usgs.gov/publication/70020207},
  note = {Source identifier: 70020207}
}