@misc{indiciae23203e29e4c9,
  title = {A coloured career-structure?},
  author = {D S Clark},
  year = {1969},
  doi = {10.1016/s0140-6736(69)91228-8},
  url = {https://pubmed.ncbi.nlm.nih.gov/4178452/},
  note = {Source identifier: 4178452}
}