@misc{indiciaeb682d4b16522,
  title = {Solutions for apparent ages and U-Pb isotope ratios of young systems without initial secular equilibrium: a computer program in Hewlett-Packard BASIC},
  author = {K.R. Ludwig},
  year = {1979},
  doi = {10.3133/ofr79722},
  url = {https://pubs.usgs.gov/publication/ofr79722},
  note = {Source identifier: ofr79722}
}