Dynamical exchange effects in a two-dimensional many-polaron gas K. J. Hameeuw, J. Tempere, F. Brosens and J. T. Devreese Eur. Phys. J. B, 37 4 (2004) 447-452 Published online: 09 April 2004 DOI: 10.1140/epjb/e2004-00080-6