@misc{indiciae59891c008c2f,
  title = {Achieving qualification--a new proposal.},
  author = {P Birchenall},
  year = {1997},
  doi = {10.1016/s0260-6917(97)80093-7},
  url = {https://pubmed.ncbi.nlm.nih.gov/9370624/},
  note = {Source identifier: 9370624}
}