@misc{indiciae74c69629c10b,
  title = {Requirements for specialization after basic experiences.},
  author = {W L Valk},
  year = {1968},
  doi = {10.1097/00000658-196810000-00005},
  url = {https://pubmed.ncbi.nlm.nih.gov/5680948/},
  note = {Source identifier: 5680948}
}