@misc{indiciaec533068abafd,
  title = {FORTRAN computer program for calculation of stress-intensity factors, stresses, and displacements associated with a fluid-pressurized fracture near the Earth's surface},
  author = {David D. Pollard},
  year = {1978},
  doi = {10.3133/ofr78160},
  url = {https://pubs.usgs.gov/publication/ofr78160},
  note = {Source identifier: ofr78160}
}