@misc{indiciaefc2093859554,
  title = {Free vibrations of thin-walled semicircular graphite-epoxy composite frames},
  author = {Noor, Ahmed K. and Carden, Huey D. and Peters, Jeanne M.},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19910004437},
  note = {Source identifier: 19910004437}
}