@misc{indiciae70bdd855b2b6,
  title = {USGS gamma-ray modeling programs},
  author = {J. S. Duval},
  year = {1997},
  doi = {10.3133/ofr9796},
  url = {https://pubs.usgs.gov/publication/ofr9796},
  note = {Source identifier: ofr9796}
}