“Investigation of the current-induced nonlinear vortex dynamics in YBa2Cu3O7 single crystals using transport and transmittivity measurements”, W. Jiang, N.-C. Yeh, C. C. Fu, M. Konczykowski, and P. Holtzberg, Physica C 282-287, 1947 (1997).
http://www.sciencedirect.com/science/article/pii/S0921453497010368