TY  - RPRT
TI  - Equivalent spring-mass system for normal modes
AU  - Bamford, R. M.
AU  - Gayman, W. H.
AU  - Wada, B. K.
PY  - 1971
UR  - https://ntrs.nasa.gov/citations/19710009805
ID  - 19710009805
ER  -