@misc{indiciaef55c94462f81,
  title = {Occurrence of strontium in natural water},
  author = {M. W. Skougstad and C. Albert Horr},
  year = {1960},
  doi = {10.3133/cir420},
  url = {https://pubs.usgs.gov/publication/cir420},
  note = {Source identifier: cir420}
}