@misc{indiciae35a19c0473e4,
  title = {Vocational registration.},
  author = {P S Byrne},
  year = {1969},
  doi = {10.1016/s0140-6736(69)90141-x},
  url = {https://pubmed.ncbi.nlm.nih.gov/4184511/},
  note = {Source identifier: 4184511}
}