@misc{indiciaea173f2ef9503,
  title = {The finite element duct eigenvalue problem - An improved formulation with Hermitian elements and no-flow condensation},
  author = {Astley, R. J. and Eversman, W.},
  year = {1980},
  url = {https://ntrs.nasa.gov/citations/19800047654},
  note = {Source identifier: 19800047654}
}