@misc{indiciae0683e17ed3f5,
  title = {Two-stage, low noise advanced technology fan. Volume 3: Acoustic data},
  author = {Sofrin, T. G. and Riloff, N., Jr.},
  year = {1975},
  url = {https://ntrs.nasa.gov/citations/19760019108},
  note = {Source identifier: 19760019108}
}