@misc{indiciaef270028d5ef3,
  title = {ISOPLOT for MS-DOS, a plotting and regression program for radiogenic-isotope data, for IBM-PC compatible computers, version 1.00},
  author = {K.R. Ludwig},
  year = {1988},
  doi = {10.3133/ofr88557},
  url = {https://pubs.usgs.gov/publication/ofr88557},
  note = {Source identifier: ofr88557}
}