A comparison between nonlinear cantilever and buckled beam for energy harvesting H. Vocca, F. Cottone, I. Neri and L. Gammaitoni Eur. Phys. J. Special Topics, 222 7 (2013) 1699-1705 Published online: 30 September 2013 DOI: 10.1140/epjst/e2013-01956-2