@misc{indiciaed4cd6b800525,
  title = {Application of mixed-mode, solid-phase extraction in environmental and clinical chemistry. Combining hydrogen-bonding, cation-exchange and Van der Waals interactions},
  author = {M. S. Mills and E.M. Thurman and M.J. Pedersen},
  year = {1993},
  doi = {10.1016/0021-9673(93)80349-d},
  url = {https://pubs.usgs.gov/publication/70018255},
  note = {Source identifier: 70018255}
}