Polymer chain in a quenched random medium: slow dynamics and ergodicity breaking G. Migliorini, V. G. Rostiashvili and T. A. Vilgis Eur. Phys. J. B, 33 1 (2003) 61-73 Published online: 23 May 2003 DOI: 10.1140/epjb/e2003-00142-3