Nonlinear ac response of the vortex system in the cubic (K, Ba)BiO3 superconductor A. Conde-Gallardo, I. Joumard, J. Marcus and T. Klein Eur. Phys. J. B, 11 2 (1999) 255-259 Published online: 15 September 1999 DOI: 10.1007/s100510050936