TY  - RPRT
TI  - A simple method for designing structural models with closely spaced modes of vibration
AU  - Hallauer, W. L., Jr.
AU  - Weisshaar, T. A.
AU  - Shostak, A. G.
PY  - 1978
UR  - https://ntrs.nasa.gov/citations/19790036490
ID  - 19790036490
ER  -