@misc{indiciaee15417dbbf5e,
  title = {Letter: safer cigarettes.},
  author = {C M Fletcher and K Ball},
  year = {1975},
  doi = {10.1136/bmj.2.5971.613-c},
  url = {https://pubmed.ncbi.nlm.nih.gov/1131640/},
  note = {Source identifier: 1131640}
}