@misc{indiciaef5ee0c513e42,
  title = {A finite element formulation of the eigenvalue problem in lined ducts with flow},
  author = {Astley, R. J. and Eversman, W.},
  year = {1979},
  url = {https://ntrs.nasa.gov/citations/19790062383},
  note = {Source identifier: 19790062383}
}