1. D. Karnoop, M.J. Crosby, R.A. Harwood, Vibration control using semi-active force generators, American Society of Mechanical Engineers, Journal of Engineering for Industry May (1974) 619–626.
2. Design principles of for vibration control using semi-active dampers;Karnoop;American Society of Mechanical Engineers, Journal of Dynamic Systems, Measurement, and Control,1990
3. Vibration and shock isolation performance of a semi-active on off damper;Rakheja;American Society of Mechanical Engineers, Journal of Vibration, Acoustics, Stress, and Reliability in Design,1985
4. H. Yoshida, et al., Sky-hook following control of vehicle using an ER damper, Proceedings of the Ninth SEAD, Vol. C14, 1997, pp. 493–502.
5. A.K. Carter, Transient motion control of passive and semi-active damping for vehicle suspension, Masters Thesis, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA, 1998.