@misc{indiciaea182fd47c954,
  title = {Proficiency analytical testing (PAT) program.},
  author = {C A Esche and J H Groff},
  year = {1997},
  doi = {10.1080/00028894.1997.10399334},
  url = {https://pubmed.ncbi.nlm.nih.gov/9291560/},
  note = {Source identifier: 9291560}
}