Dynamical two electron states in a Hubbard-Davydov model L. Cruzeiro, J. C. Eilbeck, J. L. Marín and F. M. Russell Eur. Phys. J. B, 42 1 (2004) 95-102 Published online: 26 November 2004 DOI: 10.1140/epjb/e2004-00360-1