Friswell, M., Carrella, A., Friswell, M., Zotov, A., Ewins, D., & Tichonov, A. (2009). Using nonlinear springs to reduce the whirling of a rotating shaft. Mechanical Systems and Signal Processing, 23(7), pp. 2228-2235. doi:10.1016/j.ymssp.2009.03.006

Friswell, Michael, A. Carrella, M.I Friswell, A. Zotov, D.J Ewins, and A. Tichonov. "Using Nonlinear Springs to Reduce the Whirling of a Rotating Shaft." Mechanical Systems and Signal Processing 23, no. 7 (2009): 2228-2235.

Friswell, Michael, et al. "Using Nonlinear Springs to Reduce the Whirling of a Rotating Shaft." Mechanical Systems and Signal Processing 23.7 (2009): 2228-2235.