@misc{indiciae35730a3ce60e,
  title = {BASIC programs for computing displacements, strains, and tilts from quadrilateral measurements},
  author = {Arvid M. Johnson and Rex L. Baum},
  year = {1987},
  doi = {10.3133/ofr87343},
  url = {https://pubs.usgs.gov/publication/ofr87343},
  note = {Source identifier: ofr87343}
}