@misc{indiciaea6a1b3b5cafa,
  title = {PBDAT200; a computer program for processing raw Pb-U-Th isotope data},
  author = {K.R. Ludwig},
  year = {1985},
  doi = {10.3133/ofr85547},
  url = {https://pubs.usgs.gov/publication/ofr85547},
  note = {Source identifier: ofr85547}
}