@misc{indiciae251fa28c0fb2,
  title = {Recertification attained through aggressive challenge.},
  author = {B L Kelly and S K Casper and B A Krueger},
  year = {1990},
  url = {https://pubmed.ncbi.nlm.nih.gov/10104936/},
  note = {Source identifier: 10104936}
}