@misc{indiciaece5f2ca34c89,
  title = {Flow structure generated by perpendicular blade-vortex interaction and implications for helicopter noise prediction. Volume 1: Measurements},
  author = {Wittmer, Kenneth S. and Devenport, William J.},
  year = {1996},
  url = {https://ntrs.nasa.gov/citations/19960014827},
  note = {Source identifier: 19960014827}
}