@misc{indiciaec4c2140c2c4f,
  title = {Orf.},
  author = {R P Robertson},
  year = {1968},
  doi = {10.1016/s0140-6736(68)92932-2},
  url = {https://pubmed.ncbi.nlm.nih.gov/4172714/},
  note = {Source identifier: 4172714}
}