@misc{indiciae92f431256078,
  title = {Solid-phase extraction technique for the analysis of biological samples.},
  author = {T R Krishnan and I Ibraham},
  year = {1994},
  doi = {10.1016/0731-7085(94)90001-9},
  url = {https://pubmed.ncbi.nlm.nih.gov/8031926/},
  note = {Source identifier: 8031926}
}