@misc{indiciaed09b3dcbf6c9,
  title = {Certification and recertification.},
  author = {S C Scheiber},
  year = {1991},
  doi = {10.1007/bf01955629},
  url = {https://pubmed.ncbi.nlm.nih.gov/1780385/},
  note = {Source identifier: 1780385}
}