Friswell, M., Friswell, M. I., Ali, S. F., Bilgen, O., Adhikari, S., Lees, A. W., & Litak, G. (2012). Non-linear piezoelectric vibration energy harvesting from a vertical cantilever beam with tip mass. Journal of Intelligent Material Systems and Structures, 23(13), p. 1505. doi:10.1177/1045389x12455722

Friswell, Michael, M. I. Friswell, S. F. Ali, O. Bilgen, S. Adhikari, A. W. Lees, and G. Litak. "Non-linear Piezoelectric Vibration Energy Harvesting From a Vertical Cantilever Beam With Tip Mass." Journal of Intelligent Material Systems and Structures 23, no. 13 (2012): 1505.

Friswell, Michael, et al. "Non-linear Piezoelectric Vibration Energy Harvesting From a Vertical Cantilever Beam With Tip Mass." Journal of Intelligent Material Systems and Structures 23.13 (2012): 1505.