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2. Kidd, D. L., Balke, R. W., Wilson, W. F., and Wenicke, R. K., “Recent Advances in Helicopter Vibration Control,” Paper presented at 26th Annual AHS National Forum, Washington, June 1970.
3. O'Leary, J. J., “Reduction in Vibration of the CH-47C Helicopter Using Self-Tuning Vibration Absorbers,” Paper presented at Shock and Vibration Symposium, Dec. 1969.
4. Amer, K. B. and Neff, J. R., “Vertical-Plane Pendulum Absorbers for Minimizing Helicopter Vibratory Loads,” American Helicopter Society and NASA/Ames Research Center Specialists Meeting on Rotorcraft Dynamics, Moffett Field, Ca., Feb. 1974, NASA SP-352.
5. Taylor, R. B. and Teare, P. A., “Helicopter Vibration Reduction with Pendulum Absorbers,” Paper presented at 30th Annual AHS National Forum, Washington, June 1970.