Vortex washboard voltage noise in type-II superconductors T. J. Bullard, J. Das, G. L. Daquila and U. C. Täuber Eur. Phys. J. B, 65 4 (2008) 469-484 Published online: 25 September 2008 DOI: 10.1140/epjb/e2008-00358-7