TY  - RPRT
TI  - An active optimal control strategy of rotor vibrations using external forces
AU  - Zhu, W.
AU  - Castelazo, I.
AU  - Nelson, H. D.
PY  - 1989
UR  - https://ntrs.nasa.gov/citations/19900059169
ID  - 19900059169
ER  -