@misc{indiciaea05b07def20c,
  title = {Geared-elevator flutter study},
  author = {Ruhlin, C. L. and Doggett, R. V., Jr. and Gregory, R. A.},
  year = {1976},
  url = {https://ntrs.nasa.gov/citations/19760021070},
  note = {Source identifier: 19760021070}
}