Spin-echo observation of radio frequency induced flux lattice annealing (RIFLA) in a type-II superconductor W.G. Clark, F. Lefloch, M.E. Hanson and W.H. Wong J. Phys. IV France, 09 PR10 (1999) Pr10-49-Pr10-51 DOI: 10.1051/jp4:19991012