@misc{indiciaec05500f3fc91,
  title = {Proficiency testing programs--promises, progress, and problems. A 40-year prospective.},
  author = {R H Laessig and S S Ehrmeyer},
  year = {1988},
  url = {https://pubmed.ncbi.nlm.nih.gov/3355326/},
  note = {Source identifier: 3355326}
}