Spectral properties of incommensurate charge-density wave systems G. Seibold, F. Becca, F. Bucci, C. Castellani, C. Di Castro and M. Grilli Eur. Phys. J. B, 13 1 (2000) 87-97 Published online: 15 January 2000 DOI: 10.1007/s100510050013