Diffusion mechanisms of localised knots along a polymer R. Metzler, W. Reisner, R. Riehn, R. Austin, J. O. Tegenfeldt and I. M. Sokolov Europhys. Lett., 76 4 (2006) 696-702 Published online: 20 October 2006 DOI: 10.1209/epl/i2006-10312-5