@misc{indiciae8fe12def9728,
  title = {Optimal surface for impression cytology.},
  author = {R F Refaat and D Allan},
  year = {1990},
  doi = {10.1136/bjo.74.4.254-a},
  url = {https://pubmed.ncbi.nlm.nih.gov/2186797/},
  note = {Source identifier: 2186797}
}