@misc{indiciae0fb58109c909,
  title = {The flow mechanism in the Chalk based on radio-isotope analyses of groundwater in the London Basin},
  author = {R.A. Downing and F.J. Pearson and D. B. Smith},
  year = {1979},
  doi = {10.1016/0022-1694(79)90088-x},
  url = {https://pubs.usgs.gov/publication/70012532},
  note = {Source identifier: 70012532}
}