@misc{indiciae55217e9bf1e1,
  title = {Sound directivity pattern radiated from small airfoils.},
  author = {Hersh, A. S. and Meecham, W. C.},
  year = {1973},
  url = {https://ntrs.nasa.gov/citations/19730040178},
  note = {Source identifier: 19730040178}
}