@misc{indiciae6bd24a17d9d1,
  title = {Rapid determination of fluorine in phosphate rocks},
  author = {Leonard Shapiro},
  year = {2002},
  doi = {10.1021/ac60160a041},
  url = {https://pubs.usgs.gov/publication/70220579},
  note = {Source identifier: 70220579}
}