@misc{indiciae618e86cc36dc,
  title = {The determination of nanogram amounts of Chromium in urine by x-ray fluorescence spectroscopy},
  author = {K. Beyermann and H. J. Rose and R.P. Christian},
  year = {1969},
  doi = {10.1016/s0003-2670(00)89385-x},
  url = {https://pubs.usgs.gov/publication/70011529},
  note = {Source identifier: 70011529}
}