@misc{indiciaeeed6ec75c52a,
  title = {Nonlinear least-squares inversion of infinite line source data (program NLSINF)},
  author = {W.L. Anderson},
  year = {1989},
  doi = {10.3133/ofr89555},
  url = {https://pubs.usgs.gov/publication/ofr89555},
  note = {Source identifier: ofr89555}
}