@misc{indiciae345fb6798efa,
  title = {Recurrent ulcer treated with colloidal bismuth.},
  author = {J Koo and S K Lam},
  year = {1983},
  doi = {10.5694/j.1326-5377.1983.tb99353.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/6571529/},
  note = {Source identifier: 6571529}
}