@misc{indiciaedfa3d08fa1b6,
  title = {Age determination of zircon crystals from Ceylon},
  author = {David Gottfried and F. E. Senftle and C. Waring},
  year = {1954},
  doi = {10.3133/tei459},
  url = {https://pubs.usgs.gov/publication/tei459},
  note = {Source identifier: tei459}
}