Nonlinear dynamics of a bistable piezoelectric-composite energy harvester for broadband applicationD.N. Betts, C.R. Bowen, H.A. Kim, N. Gathercole, C.T. Clarke and D.J. InmanEur. Phys. J. Special Topics, 222 7 (2013) 1553-1562DOI: https://doi.org/10.1140/epjst/e2013-01944-6