Ground state features of the Fröhlich model G. De Filippis, V. Cataudella, V. Marigliano Ramaglia, C. A. Perroni and D. Bercioux Eur. Phys. J. B, 36 1 (2003) 65-73 Published online: 19 November 2003 DOI: 10.1140/epjb/e2003-00317-x