@misc{indiciaeec825bc8ebe5,
  title = {Determination of beta activity in water},
  author = {F. B. Barker and B.P. Robinson},
  year = {1963},
  doi = {10.3133/wsp1696a},
  url = {https://pubs.usgs.gov/publication/wsp1696A},
  note = {Source identifier: wsp1696A}
}