@misc{indiciae7a9e76d63998,
  title = {Certification, recertification and added qualifications.},
  author = {E S Stauffer},
  year = {1989},
  doi = {10.3928/0147-7447-19890501-04},
  url = {https://pubmed.ncbi.nlm.nih.gov/2726610/},
  note = {Source identifier: 2726610}
}