1. 1Richards, M. and Podob, R. "Development of an Advanced Energy Absorber," Proceedings of 35thannual SAFE symposium, 1997.
2. The Evolution of Energy Absorption Systems for Crashworthy Helicopter Seats
3. 4Harrer, K. L., Yniguez, D., Majar, M., Ellenbecker, D., Estrada, N., and Geiger, M. "Whole Body Vibration Exposure for MH-60S Pilots," Proceedings of the Forty Third Annual SAFE Association Symposium, Salt Lake City, Utah, October24-26,2005, pp.303-314.
4. Back pain and exposure to whole body vibration in helicopter pilots