Y. Suda and T. Shiba, “New Hybrid Suspension System with Active Control and Energy Regeneration,” Vehicle System Dynamic Supplement, Vol. 25, Supple. 1, 1996, pp. 641-654. doi:10.1080/00423119608969226
 Y. Suda, S. Nakadai and K. Nakano, “Hybrid Suspension System With Skyhook Control and Energy Regeneration (Development of Self-Powered Active Suspension),” Vehicle System Dynamic Supplement, Vol. 19, 1998, pp. 619634.
 K. Nakano, Y. Suda and S. Nakadai, “Self-Powered Active Vibration Control Using a Single Electric Actuator,” Journal of Sound Vibration, Vol. 260, No. 2, 2003, pp. 213-235. doi:10.1016/S0022-460X(02)00980-X
 Y. Okada, H. Harada and K. Suzuki, “Active and Regenerative Control of an Electrodynamic-Type Suspension,” JSME Internatioanl Journal Series C, Vol. 40, No. 2, 1997, pp. 272-278. doi:10.1299/jsmec.40.272
 B. L. J. Gysen, J. L. G. Janssen, J. J. H. Paulides and E. A. Lomonova, “Design Aspects of an Active Electromagnetic Suspension System for Automotive Applications,” IEEE Transactions on Industry Applications, Vol. 45, No. 5, 2009, pp. 1589-1597. doi:10.1109/TIA.2009.2027097
 A. Gupta, J. A. Jendrzejczyk, T. M. Mulcahy and J. R. Hull, “Design of Electromagnetic Shock Absorber,” International Journal of Mechanics and Materials in Desigh, Vol. 3, No. 3, 2006, pp. 285-291.
 L. Zuo, B. Scully, J. Shestani and Y. Zhou, “Design and Characterization of an Electromagnetic Energy Harvester for Vehicle Suspensions,” Smart Materials and Structures, Vol. 19, No. 4, 2010, Article ID: 045003. doi:10.1088/0964-1726/19/4/045003
 R. Rajamani and J. K. Hedrick, “Performance of Active Automotive Suspensions with Hydraulic Actuator: Theory and Experiment,” Proceedings of the American Control Conference, Baltimore, June 1994, pp. 1214-1218.
 S. N. Avadhany, “Analysis of Hydraulic Power Transduction in Regenerative Rotary Shock Absorbers as Function of Working Fluid Kinematic Viscosity,” Massachusetts Institute of Technology, Cambridge, 2009.
 J.-F. Saillant, S. Cochran, S. Ballandras, R. Berriet and G. Fleury, “Theoretical Effect of Epoxy Interlayer Bonds in Multilayer Piezoelectric Transducers,” IEEE Ultrasonics Symposium, Paisley, 28-31 October 2007, pp. 191-194. doi:10.1109/ULTSYM.2007.59
 Y.-J. Luo, M.-L. Xu and X.-N. Zhang, “Modeling and Simulation of a New Piezoelectric Stack Actuator with Bi-Direction Outputs,” IEEE Symposium on Piezoelectricity, Acoustic Waves and Device Applications (SPAWDA), Xi’an, 10-13 December 2010, pp. 290-295.
 X. Li, M.-S. Guo and S.-X. Dong, “A Flex-Compressive-Mode Piezoelectric Transducer for Mechanical Vibration/Strain Energy Harvesting,” IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, Vol. 58, No. 4, 2011, pp. 698-703. doi:10.1109/TUFFC.2011.1862
 J. Feenstra, J. Granstrom and H. Sodano, “Energy Harvesting through a Backpack Employing a Mechanically Amplified Piezoelectric Stack,” Mechanical Systems and Signal Processing, Vol. 22, No. 3, 2008, pp. 721-734. doi:10.1016/j.ymssp.2007.09.015