@misc{indiciae88e4095ab78c,
  title = {The inverse problem of refraction travel times, part II: Quantifying refraction nonuniqueness using a three-layer model},
  author = {J. Ivanov and R. D. Miller and J. Xia and D. Steeples},
  year = {2005},
  doi = {10.1007/s00024-004-2616-0},
  url = {https://pubs.usgs.gov/publication/70029114},
  note = {Source identifier: 70029114}
}