@misc{indiciae48408e73e2d3,
  title = {Helicopters.},
  author = {C M Dryden and J A Davidson and J R Dougall and P G Wallace},
  year = {1992},
  url = {https://pubmed.ncbi.nlm.nih.gov/1629862/},
  note = {Source identifier: 1629862}
}