Zhang, J., Shaw, A., Amoozgar, M., Friswell, M., & Woods, B. K. (2019). Bidirectional torsional negative stiffness mechanism for energy balancing systems. Mechanism and Machine Theory, 131, pp. 261-277. doi:10.1016/j.mechmachtheory.2018.10.003

Zhang, Jiaying, Alexander Shaw, Mohammadreza Amoozgar, Michael Friswell, and Benjamin K.S Woods. "Bidirectional Torsional Negative Stiffness Mechanism for Energy Balancing Systems." Mechanism and Machine Theory 131 (2019): 261-277.

Zhang, Jiaying, et al. "Bidirectional Torsional Negative Stiffness Mechanism for Energy Balancing Systems." Mechanism and Machine Theory 131 (2019): 261-277.