@misc{indiciae7fb41ebf1e9d,
  title = {Letter: Special classes.},
  author = {R Smee},
  year = {1975},
  doi = {10.1038/sj.bdj.4803630},
  url = {https://pubmed.ncbi.nlm.nih.gov/127593/},
  note = {Source identifier: 127593}
}