@misc{indiciaea1d6e02680a7,
  title = {Determination of radium in water},
  author = {Franklin Butt Barker and J. O. Johnson},
  year = {1964},
  doi = {10.3133/wsp1696b},
  url = {https://pubs.usgs.gov/publication/wsp1696B},
  note = {Source identifier: wsp1696B}
}