Friswell, M., Borowiec, M., Litak, G., & Adhikari, S. (2014). Energy Harvesting in a Nonlinear Cantilever Piezoelastic Beam System Excited by Random Vertical Vibrations. International Journal of Structural Stability and Dynamics, 14(08), p. 1440018. doi:10.1142/S0219455414400185

Friswell, Michael, Marek Borowiec, Grzegorz Litak, and Sondipon Adhikari. "Energy Harvesting in a Nonlinear Cantilever Piezoelastic Beam System Excited By Random Vertical Vibrations." International Journal of Structural Stability and Dynamics 14, no. 08 (2014): 1440018.

Friswell, Michael, Marek Borowiec, Grzegorz Litak, and Sondipon Adhikari. "Energy Harvesting in a Nonlinear Cantilever Piezoelastic Beam System Excited By Random Vertical Vibrations." International Journal of Structural Stability and Dynamics 14.08 (2014): 1440018.