TY  - RPRT
TI  - The finite element duct eigenvalue problem - An improved formulation with Hermitian elements and no-flow condensation
AU  - Astley, R. J.
AU  - Eversman, W.
PY  - 1980
UR  - https://ntrs.nasa.gov/citations/19800047654
ID  - 19800047654
ER  -