@misc{indiciae007b4a99c775,
  title = {Why IFR (instrument flight rules)?},
  author = {C Shuford and R N Anderson},
  doi = {10.1016/s1067-991x(00)90029-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/11184484/},
  note = {Source identifier: 11184484}
}