@misc{indiciae7c2a19bba027,
  title = {PETAL3; PEnetration Testing and Liquefaction; an interactive computer program},
  author = {Albert T. Chen},
  year = {1988},
  doi = {10.3133/ofr88540},
  url = {https://pubs.usgs.gov/publication/ofr88540},
  note = {Source identifier: ofr88540}
}