@misc{indiciae6d3dc1a067a0,
  title = {PETAL; pnetrating testing and liquefaction, an interactive computer program},
  author = {A.T. Chen},
  year = {1984},
  doi = {10.3133/ofr84290},
  url = {https://pubs.usgs.gov/publication/ofr84290},
  note = {Source identifier: ofr84290}
}