@misc{indiciaea8c8bf2e92fe,
  title = {The inverse problem of refraction travel times, part I: Types of Geophysical Nonuniqueness through Minimization},
  author = {J. Ivanov and R. D. Miller and J. Xia and D. Steeples and C.B. Park},
  year = {2005},
  doi = {10.1007/s00024-004-2615-1},
  url = {https://pubs.usgs.gov/publication/70028767},
  note = {Source identifier: 70028767}
}