@misc{indiciae947d9e72ccaa,
  title = {A computer program to trace seismic ray distribution in complex two-dimensional geological models},
  author = {Nazieh K. Yacoub and James H. Scott},
  year = {1970},
  doi = {10.3133/70042621},
  url = {https://pubs.usgs.gov/publication/70042621},
  note = {Source identifier: 70042621}
}