@misc{indiciaeb2115547b0d6,
  title = {Letter: Passovoy factor.},
  author = {E A Beck},
  year = {1975},
  doi = {10.1016/s0140-6736(75)90938-1},
  url = {https://pubmed.ncbi.nlm.nih.gov/51385/},
  note = {Source identifier: 51385}
}