@misc{indiciae9607f437be5e,
  title = {Category "A" operations for twin-engine helicopters.},
  author = {C Lunaas},
  year = {1991},
  doi = {10.1016/s1046-9095(05)80504-5},
  url = {https://pubmed.ncbi.nlm.nih.gov/10115691/},
  note = {Source identifier: 10115691}
}