Output response identification in a multistable system for piezoelectric energy harvesting Peter Harris, Mustafa Arafa, Grzegorz Litak, Chris R. Bowen and Joanna Iwaniec Eur. Phys. J. B, 90 1 (2017) 20 Published online: 25 January 2017 DOI: 10.1140/epjb/e2016-70619-y