@misc{indiciaed1a12b737af1,
  title = {Radionuclides as tracers and timers in surface and groundwater},
  author = {Robert L. Michel},
  year = {2009},
  doi = {10.1016/s1569-4860(09)01605-2},
  url = {https://pubs.usgs.gov/publication/70199105},
  note = {Source identifier: 70199105}
}