@misc{indiciaea421c8c3ad8a,
  title = {The Aerodynamic Characteristics of Four Full-Scale Propellers Having Different Plan Forms},
  author = {Hartman, Edwin P and Biermann, David},
  year = {1938},
  url = {https://ntrs.nasa.gov/citations/19930091718},
  note = {Source identifier: 19930091718}
}