@misc{indiciaea44460485a1f,
  title = {Proficiency Analytical Testing (PAT) Program (November 30, 1996).},
  author = {C A Esche and J H Groff},
  year = {1997},
  doi = {10.1080/00028894.1997.10399237},
  url = {https://pubmed.ncbi.nlm.nih.gov/9075308/},
  note = {Source identifier: 9075308}
}